Costa Rica Snorkeling & Diving: Catalina Islands, Bat Islands & PADI

By Jenny & the local PlayaCR team·
Updated 2026·Guanacaste, Costa Rica
Costa Rica snorkeling - underwater scene with a snorkeler and sea turtle on a Pacific reef

Costa Rica snorkeling and diving off the Guanacaste coast happens at two world-class destinations: the Catalina Islands (30 minutes offshore, all levels, sea turtles and rays) and the Bat Islands (2 hours offshore, advanced divers, Pacific bull sharks year-round). This is the complete 2026 guide to snorkel tours, scuba diving, and PADI courses in Tamarindo, Flamingo, and Playas del Coco – and how we book the right boat for your level.

What is the snorkeling and diving like in Costa Rica?

Costa Rica’s Pacific Guanacaste coast has two main dive destinations – the Catalina Islands (volcanic outcrops 30 minutes offshore, accessible to snorkelers and certified divers, with sea turtles, rays, white-tip reef sharks, and big schools of jacks) and the Bat Islands (2 hours offshore from Playas del Coco, an advanced-only dive site with year-round Pacific bull shark aggregations – one of the marquee dive sites in Central America). Snorkel tours run $50 to $100, dive trips $130 to $300, PADI Open Water certification $450 to $650.

Fast facts: snorkel & dive in Guanacaste

Half-day snorkel: $50 – $100 / pp
2-tank dive: $130 – $200 / pp
Bat Islands: $200 – $300 / pp
PADI Open Water: $450 – $650 / pp
Best visibility: Dec – Apr (30-60 ft)
Best big animals: Jun – Oct

4 ways to snorkel & dive in Costa Rica

Pick by your level, certification, and how much time you have. The Catalinas are the everyday answer; the Bat Islands are the bucket-list day.

Catalina Islands Snorkel Tour Costa Rica

Catalina Islands Snorkel Tour

Half-day · 6+
Boat to volcanic islands 30 min offshore. Multiple reef stops. Open to all swimmers – no certification needed.
$50 – $100 / pp
Catalina Islands 2-Tank Dive Costa Rica

Catalina Islands 2-Tank Dive

Full-day · 12+ (cert)
Two dive sites at the Catalinas. Mantas, rays, sea turtles, white-tip reef sharks. Open Water cert required.
$130 – $200 / pp
Bat Islands Bull Shark Dive Costa Rica

Bat Islands Bull Shark Dive

Full-day · Advanced cert
The marquee shark dive in Central America. Advanced cert + 50+ logged dives. Boat from Playas del Coco.
$200 – $300 / pp
Beach & Catamaran Snorkel Costa Rica

Beach & Catamaran Snorkel

2 – 6 hours · 4+
Snorkel from shore at Playa Conchal or Las Catalinas, or on a catamaran snorkel stop. No experience needed.
$0 – $150 / pp

The Catalina Islands: Costa Rica’s closest dive paradise

Catalina Islands Costa Rica - dive boat anchored offshore

The Catalina Islands are a string of volcanic rock outcrops 30 minutes offshore from Flamingo, Potrero, and Playas del Coco. The most-dived destination in Guanacaste, with multiple sites ranging from 20 to 100 feet. Best visibility December to April (30 to 60 feet); summer plankton bloom drops it to 15 to 30 feet but brings rays and big animals.

Snorkelers can access the shallower Catalina sites (20 to 25 feet) on most dive boats – the boat anchors, snorkelers stay above, divers go below. Boats leave between 7 and 8 am, return by 1 to 2 pm.

The Bat Islands: bull shark diving in Costa Rica

Bat Islands Costa Rica - Pacific bull shark dive

The Bat Islands (Las Islas Murcielago) are 35 miles offshore from Playas del Coco – the northernmost dive site on the gold coast. The marquee site is the “Big Scare,” where Pacific bull sharks aggregate year-round but peak June through October.

Strict requirements: Advanced Open Water certification minimum, 50+ logged dives, and recent dive experience. The currents and visibility shift; boats only run when conditions are right (which is often).

It is a full-day commitment: 6 to 7 am departure, 2-hour boat ride each way, two tanks, return by mid-afternoon. Bring food, sea-sickness medication, and your log book.

Catalina Islands vs Bat Islands: which to pick

The most common question we get from divers planning a Guanacaste trip. Here is the straight side-by-side.

Catalina Islands Bat Islands
Distance offshore 30 min 2 hours
Depth range 20 – 100 ft 40 – 100+ ft
Who it is for Snorkelers + divers (all levels) Advanced divers only
Marquee marine life Turtles, rays, schools of fish, white-tip reef sharks Bull sharks (year-round), mantas (summer), mola mola
Certification needed Open Water (snorkelers welcome) Advanced + 50 logged dives
Price $50 – $200 / pp $200 – $300 / pp
Trip length Half-day Full day

PADI courses in Costa Rica

Costa Rica is a top destination for getting certified – warm water, calm seas, plenty of reef sites, and bilingual instructors. PADI is the dominant agency on this coast.

1/2 day

Discover Scuba Diving

Try-dive for total beginners. Brief in the pool then a shallow open-water dive. No certification – just see if you like it.
$120 – $180 / pp
3 – 4 days

PADI Open Water Certification

Full beginner certification – classroom, pool, four ocean dives. The standard global dive ticket.
$450 – $650 / pp
2 days

PADI Advanced Open Water

Five adventure dives (deep, navigation, plus electives). Required for Bat Islands and most deeper sites.
$350 – $500 / pp
1 day

Refresher / Specialty

Skills refresh for divers out of the water 6+ months. Or specialty courses (nitrox, deep, wreck).
$120 – $250 / pp

Marine life: what you will see underwater

The Pacific off Guanacaste runs the full range from reef fish to apex predators. Twelve species you can reliably see or expect:

Green & Hawksbill Sea Turtles

Year-round
Common at the Catalinas. Often glide past divers without concern.
Pacific Bull Shark

Year-round, peak Jun – Oct
Bat Islands only. Advanced dive. 6-10 ft adult sharks, generally tolerant of divers.
Spotted Eagle Ray

Year-round
Catalinas + Bat Islands. Solo or small groups gliding past mid-water.
Giant Pacific Manta Ray

Jun – Oct (best)
Best at the Bat Islands during plankton season.
White-tip Reef Shark

Year-round
Resting under ledges at most Catalina sites. Not aggressive.
Devil Rays

Jul – Oct
Schools of 10 to 50 cruising mid-water.
Pacific Octopus

Year-round
Under rocks at most reef sites. Skilled guides find them.
Moray Eels

Year-round
In every crack and crevice. Look but do not touch.
Schools of Jacks & Snapper

Year-round
Huge silver schools at the Catalinas – postcard underwater shots.
Spotted Dolphins

Year-round (sightings vary)
Sometimes accompany the boat in and out.
Parrotfish, Angels, Butterflies

Year-round
Reef-fish life is rich and colorful, especially at shallower snorkel depths.
Humpback Whales (heard)

Dec – Mar / Jul – Oct
You can sometimes hear them singing while diving in season.
Spotted eagle ray gliding through clear blue Pacific water at the Catalina Islands

Best season for snorkel & dive in Costa Rica

December – April (dry season): The visibility window. Clear water (30 to 60 ft visibility), calm Pacific mornings, predictable conditions. The standard “I want to see fish and have nice photos” season.

May – November (green season): Visibility drops to 15 to 30 ft as plankton blooms come in. But that plankton brings the big animals – mantas, devil rays, mola mola, and the bull sharks at the Bat Islands peak. The trade-off: less Instagram-perfect photos, way more pelagic action.

Water temperature: 78 to 82F most of the year. Summer thermocline can drop to 68 to 72F at depth – a 5mm wetsuit is worth bringing for Bat Islands or deeper Catalina sites.

Beach snorkel spots near Tamarindo

Playa Conchal – the crushed-shell beach is the closest reliable beach snorkel, with a shallow reef just offshore. Best at high tide. Las Catalinas beach has rocky outcrops at both ends of the cove – decent visibility on calm days. Playa Penca (near Potrero) is a small horseshoe bay with a protected reef. Bring your own mask and fins; or pick up rentals in Tamarindo for $10 to $15 per day.

What to bring

  • ●Reef-safe sunscreen (required in Costa Rica marine parks)
  • ●Long-sleeve UPF rashguard – protects from sun and stinging plankton
  • ●Polarized sunglasses for the boat ride out
  • ●Water and a snack (Bat Islands days are long)
  • ●Motion sickness meds the night before AND morning of
  • ●Your own mask if you wear glasses (prescription rentals are limited)
  • ●A waterproof phone case or GoPro for shore-side photos
  • ●Dive log book (for certified divers, especially Bat Islands)

Booking through us, vs going direct

Local concierge planning a Costa Rica snorkel and dive trip

Dive operators on this coast range from PADI-certified pros with current insurance and well-maintained gear to fly-by-night outfits with rusty tanks. The Bat Islands trip especially needs an experienced captain and divemaster who reads the conditions.

We book through PADI-affiliated dive shops we have personally dived with – current insurance, recent gear, experienced divemasters who know the sites cold. The advice is free, the booking is free, the prices are local. Read why booking with us is free →

Frequently asked questions

What is the best snorkeling in Costa Rica?
The best snorkeling in Guanacaste is at the Catalina Islands – a string of volcanic rocks 30 minutes offshore from Flamingo, Potrero, or Playas del Coco. Multiple reef stops, sea turtles, rays, white-tip reef sharks, big schools of jacks. From the beach: Playa Conchal (crushed-shell beach with shallow reef), Las Catalinas, and Playa Penca all have reliable beach snorkel.
Catalina Islands vs Bat Islands – which should I pick?
Catalina Islands for snorkeling and most divers – 30 minutes offshore, open to all swimmers, multiple sites with turtles and rays. Bat Islands for advanced divers chasing big sharks – 2 hours offshore, advanced cert + 50+ dives required, year-round bull shark aggregations. If you are not advanced-certified, the Catalinas are the right call.
Can I scuba dive in Costa Rica as a beginner?
Yes. Discover Scuba Diving is a half-day try-dive for total beginners – pool briefing then a shallow open water dive, no certification required ($120 to $180). Full PADI Open Water certification takes 3 to 4 days ($450 to $650) and is the standard global dive ticket.
Is Bat Islands shark diving safe?
For properly certified and experienced divers – yes. Pacific bull sharks at the Bat Islands are habituated to dive groups and have not had a recorded incident on a guided dive. The dive is strictly Advanced Open Water + 50 logged dives + recent diving for safety. Boats only run when current and visibility are right.
When is the best time to snorkel and dive in Costa Rica?
December to April for clearest water (visibility 30 to 60 feet) and calmer Pacific seas. May to November (green season) has more plankton, so visibility drops to 15 to 30 feet – but the plankton brings mantas, devil rays, whale sharks, and bull sharks. There is no bad month; just match the season to what you want to see.
How much does a snorkel tour cost in Costa Rica?
A half-day Catalina Islands snorkel tour runs $50 to $100 per person and includes the boat, gear, water, and a guide. Full-day catamaran snorkel sails are $150 to $250 per person (includes lunch, open bar, multiple stops). Beach snorkel from Playa Conchal or Las Catalinas is free if you have your own gear.
Do I need a wetsuit to dive in Costa Rica?
Most divers use a 3mm shorty. Water temps run 78 to 82F most of the year. The summer thermocline can drop the deeper water to 68 to 72F, so a 5mm is worth considering for Bat Islands or deeper Catalina sites.
How much does PADI Open Water cost in Costa Rica?
$450 to $650 per person for the full certification – includes online theory, pool sessions, four ocean dives, all gear rental, certification card. Takes 3 to 4 days.
Can kids snorkel in Costa Rica?
Yes – age 4+ for beach snorkel with a parent, age 6+ for boat snorkel tours, age 10+ for Discover Scuba Diving. PADI Open Water certification is age 12 and up.
Where can I rent snorkel gear in Tamarindo?
Most surf shops and dive shops in Tamarindo rent snorkel gear (mask, snorkel, fins) for $10 to $15 per day. Catamaran tours and dive trips include gear in the price. If you wear prescription glasses, bring your own mask – rentals rarely have prescription lenses.

Tell us your cert level and what you want to see – we will line up the right boat, divemaster, and site.

Plan My Dive Trip with Jenny

About this guide: Written by Jenny and the local PlayaCR concierge team in Tamarindo, Costa Rica. We have personally dived every site and every operator we recommend. Last updated 2026.