Koh Rok Nai

Ko Rok Nai is an uninhabited island inside Mu Ko Lanta National Park, about 45 minutes by speedboat south of Koh Lanta. It’s the developed half of the Ko Rok pair — home to the park’s ranger station, a small restaurant, and the only designated campsite in the group — and closes to visitors every year from 16 May to 31 October alongside its twin Ko Rok Nok and nearby Ko Haa. When open, the park entrance fee runs around 200 THB for foreign adults and 40 THB for Thai nationals, usually collected at the checkpoint or folded into the tour price.

The main beach, Ao Kwang Peeb, curves in a crescent of fine white sand backed by limestone cliffs, with the ranger station and campsite tucked just behind the tree line. Coral gardens start within a few metres of the shore, and the shallow reef flats make this one of the more forgiving snorkel spots in the archipelago — parrotfish, angelfish, and small reef sharks are regular sightings in the dry season when visibility often tops 15-20 metres. A short trail behind the beach climbs to a viewpoint over the bay, worth the ten-minute scramble if your boat schedule allows it.

Insider Tip: Ko Rok Nai’s beach sees more foot traffic than Ko Rok Nok’s because it’s the group’s main landing point — if your operator offers a stop at both islands, ask to do Rok Nok’s quieter coves first and save Rok Nai for the walk up to the viewpoint.

Watch out: The crossing from Koh Lanta or Krabi is open water, and operators cancel or reroute at short notice when swells build, especially in the shoulder weeks either side of the May-October closure. Confirm the rebooking policy before you pay, and don’t expect a refund if the park itself calls the closure early for weather.

Bring reef-safe sunscreen, your own snorkel if you have a preferred fit, drinking water, and a dry bag — the restaurant near the ranger station covers basic meals and drinks, but don’t rely on it for anything beyond that. Most day trips sell Ko Rok Nai as a pair with Ko Rok Nok on the same speedboat run, and operators departing from Koh Lanta often add a stop at Mu Koh Lanta National Park headquarters on the way back to pay the park fee or use the facilities.