Ko Lanta is an island off the Andaman Coast of Southern Thailand. Like many other destinations in Krabi Province, it is known for its diving and long white beaches. Ko Lanta consists of several islands, the two largest of which are Ko Lanta Noi and Ko Lanta Yai. However, Ko Lanta Yai is where all the tourist action is, so this article will refer to it simply as "Ko Lanta".
Don't get stuck on the super touristy west coast. The west coast is okay I suppose. But check out Old Town on the east coast if you want friendly locals and good honest Thai food. I still dream of the green prawn curries I ate there.
Ko Lanta Yai has a kind of quirky character and they've banned annoying stuff like jet skis.
I love Ko Lanta and would go back in a heartbeat.