Hurry the Similan Islands are closing soon for the season.
If you are looking for the BIG fish (whale sharks, manta rays etc) then a 3 day / 2 night Liveaboard to the Similan's and Richelieu Rock is the trip for you. 11 dives over the 3 day and visit the most famous dive site in Thailand - Richelieu Rock.
Similan Islands Liveaboards
If you are not going to be over in the next few weeks then it is not long until the new season will be around.