Just off Phuket's east coast lie three small, uninhabited islands — Khai Nok, Khai Nai, and Khai Nui — collectively known as the Khai Islands. They're one of the closest and most accessible island-hopping trips from Phuket, prized for shallow turquoise water, easy snorkeling, and a relaxed, laid-back vibe. Each island is small enough to walk end-to-end in under 30 minutes.

The 3 Islands

Khai Nok — the largest and liveliest of the three, shaped like an egg (its name literally means "egg island"). Has the best facilities: sun loungers, umbrellas, toilets, a souvenir shop, and beachfront restaurants. A popular spot to relax, swim, and feed friendly fish right off the shore.
Khai Nai — a quieter island known for its wide sandbar, shallow water, and calm swimming conditions, with schools of fish that often swim right up to shore — great for casual snorkeling and families.
Khai Nui — the smallest and most secluded of the three, surrounded by deeper water and coral reefs. Widely considered the best of the three for snorkeling, with vibrant coral and occasional sightings of baby reef sharks; has limited facilities and, on some tours, no beach landing (snorkel directly from the boat).

Timings

Departure: Speedboats leave from Phuket's east coast piers, with hotel pickup generally between 7:00–8:45 AM for morning/full-day tours, or around 11:15 AM–12:45 PM for afternoon tours.
Best time to visit: Morning departures are best — calmer seas, clearer water, and cooler temperatures before midday heat and crowds build up. If you prefer to spend your morning elsewhere, afternoon tours (returning by sunset) are a good lower-key alternative.
Boat ride: Just 15–25 minutes each way from Phuket — one of the shortest island crossings in the region.
Time needed: Half-day tours run about 4–5 hours (roughly 9:00 AM–1:30 PM or 1:00–5:30 PM); full-day tours run about 8–9 hours (around 9:00 AM–5:30 PM), with more relaxed time at each island and lunch included.
Best season: November to April (or as late as June, per some operators) for the calmest seas, clearest water, and most reliable weather; May–October is rainier with rougher conditions.

Experiences & Highlights

Snorkeling — the main draw, especially at Khai Nui and around Khai Nai's fish-filled shallows; masks and snorkels are typically provided, with fins rentable on-site.
Swimming in shallow, warm water — calm and safe enough for children, making this a popular family-friendly trip.
Fish feeding — a favorite at Khai Nok, where tame fish gather right at the shoreline.
Beach relaxation — soft white sand and sun loungers, particularly at Khai Nok and Khai Nai.
Sea-view lunch — most full-day tours include a Thai set lunch at a beachfront restaurant, usually on Khai Nok.
Combine with Phi Phi — several operators offer combined Khai Islands + Phi Phi Island day trips for those wanting a longer, more varied itinerary.

Good to Know

Facilities: Restrooms and restaurants available on Khai Nok and Khai Nai; Khai Nui has minimal facilities, so plan accordingly.
What to bring: Reef-safe sunscreen, a hat, swim shoes (rocky seabeds in places), a dry bag for valuables, and cash for extras like sarongs or drinks.
Restrictions: Not generally recommended for pregnant women, children under 1, or seniors over 70 due to the speedboat ride; the islands are not wheelchair accessible.
No overnight stay: All three islands are day-trip only, with no accommodation available.
Good for: Families, first-time snorkelers, and travelers wanting an easy, low-effort island escape without a long boat ride.