Okinawa snorkeling tours: Kerama Islands & Blue Cave
Kerama Islands: the full-day classic
The Kerama Islands are a national park about 50 minutes west of Naha by boat. The water is so clear locals call it "Kerama Blue". This full-day trip hits three snorkel stops, includes a bento lunch and jasmine tea on board, and you commonly spot sea turtles. Guides are in the water with you. Prescription masks are available if you need them. Reviewer Marko said "well planned, well executed". Dorota jumped in and "saw two sea turtles". This is the flagship Okinawa tour.
Blue Cave: the private highlight
The Blue Cave is a sea cave on the Onna coast (the west side, not far from Naha). Sunlight refracts through the water and lights the cave interior electric blue. This is a half-day, small-group private snorkel. The guide — Hiro recurs in reviews — takes photos and videos for you. Ramona called it "amazing, well organised, fun start to finish". Hiro greeted Wendy "with a big smile, professional and careful". Madison said it was "the highlight of the trip" and Hiro "took photos and videos". Rated 4.9, the highest of all five tours.
Why two snorkeling tours?
Time and experience. Kerama is a full day (sunrise to sunset roughly, plus travel). You get three stops, a larger group, and the Kerama Blue. Blue Cave is half a day, smaller, more private, and one stunning spot. Some pick both if they have 2–3 days.
Gear, turtles, and what to expect
Both tours provide wetsuits, masks, and fins. The Kerama trip is famous for turtles — reviewers saw one, two, sometimes three on a dive. The water in March to October is warm (20–25°C). Guides on both tours are experienced and in the water with you. No certification needed — these are snorkel-only tours. If you want to try scuba, see the intro-dive tour.
Book the early morning slot for Kerama — seas are calmer, snorkeling is easier, and the light is better on the reef. Blue Cave is less time-sensitive, but still morning is ideal for the light inside the cave.
When to snorkel
Best season is March to October — warm water (20–25°C), calm seas, good visibility. November to February you can still snorkel (gear keeps you warm), but the water is cooler (18–20°C) and the sea is rougher some days. Year-round operators run both tours, but Mar–Oct is peak.
Can’t make these dates?
Browse more available Okinawa islands tours and find one that fits your schedule — all with instant confirmation and free cancellation.
Still deciding? See all five tours compared, or try diving instead, or read why a guided tour beats renting a car.
Frequently asked questions
How long does the Kerama snorkel tour take?
The full day: roughly 7–8 hours total from hotel pickup to drop-off. About 50 minutes each way by boat, three snorkel stops of 45–60 minutes each, and a lunch break on board. It’s an early start — most departures are around 8 AM.
How long is the Blue Cave tour?
Half a day, typically 3–4 hours from pickup to drop-off. The cave is a shorter experience than Kerama, but the personal attention and the cave light make it stand out.
Will I see turtles on a snorkel tour?
On Kerama, yes — turtles are commonly seen. Reviewers routinely mentioned spotting them. On Blue Cave, it depends on the day and where Hiro takes you, but the cave itself is the main draw, not marine life hunting.
Do I need to know how to swim?
You should be comfortable in water, but you don’t need to be an expert. Both tours are beginner-friendly. The guides are right there, gears are provided, and reviewers with minimal experience loved both trips.
What if I get seasick?
The 50-minute crossing to Kerama can be rough in bad weather. Ginger, travel bands, or medication beforehand helps. Eat a light breakfast, stay on deck for fresh air, and focus on the horizon. The return is often calmer. Blue Cave is closer, so the sea time is shorter.