Otherwise it’s another tropical island paradise. They run long-tail boats to all the neighboring islands, with good places for snorkeling or just exploring the jungle interiors. Ko Kradan has a so-so coral reef, but so many fish that one gets rear-ended all the time.
Ko Mook has a long cave with a very low ceiling one can swim through at low tide. It opens up to a kind of cenote, a small beach and some trees completely surrounded by towering vertical cliffs. Very impressive. The screaming boatloads of school children they drag through the place takes away from the wonder a little.