Koh Phetra

Ko Phetra is the island that gives Mu Ko Phetra National Park its name, though it isn’t the park’s easiest or most visited stop — there’s no ranger station, restaurant, or campground on the island itself, and even the park’s own tourism material tends to point visitors toward Ko Bulon Le and Ko Lidi instead. What draws people here is the island’s odd-shaped limestone cliffs, honeycombed with caves where swiftlets build the nests harvested for bird’s nest soup — a valuable, closely guarded trade that means casual landing on parts of the island isn’t encouraged.

The national park entrance fee applies here as it does across Mu Ko Phetra: 200 THB for foreign adults (100 THB for children), 40 THB for Thai adults (20 THB for children), payable at the park’s checkpoints. Keep the receipt — rangers do check it. The surrounding water is the real draw for most visitors: clear and calm, with reef patches offshore good for snorkeling, and day-trip boats typically combine Ko Phetra with a couple of the park’s other islands rather than visiting it alone.

Watch out: The bird’s nest caves on the cliffs are a working commercial concession, not a tourist attraction — nest collectors guard them, and wandering off a boat operator’s usual route toward the cliffs isn’t appropriate. Stick with a recognized local tour operator, whose boats the concession holders already know.

There’s no accommodation on Ko Phetra or anywhere else in the park, so this is a day-trip stop rather than a place to stay over. Most tours run from roughly November to April, when the Andaman Sea is at its calmest and visibility is best for snorkeling; the rest of the year sees rougher seas and fewer operators running trips out.

Insider Tip: If cliffs and bird’s-nest caves are the interest rather than beach time, ask your boat operator specifically about the Ko Phetra leg of the itinerary — many day trips out of this stretch of coast default to the park’s more developed islands and treat Ko Phetra as a photo-stop from the boat rather than a landing.

Ko Phetra sits within reach of Koh Sukorn, the nearest inhabited island with places to stay, and it’s usually visited as part of a wider Mu Ko Phetra National Park day trip alongside other islands in the group, including nearby Ko Ta Keang.