Access
Access to the Similan Islands is easiest from Khao Lak in Phang Nga Province. The mainland office is in Tablamu. Boats depart daily from November-May. The trip takes three hours each way on slow boats or 70 minutes via speedboat.During the months of November-May live-aboard boats head to the Similan Islands. These dive boats depart and return from Khao Lak, Ko Lanta, Phuket, and Ranong and stay for several days at Similan National Marine Park.
According to the official website, the park is closed in the monsoon (from 16 May-31 October) yearly. These dates are subject to change.