Depends what you want.
If you want a bar right on the waters edge with stunning views, then there is Friendship Beach and Nikitas.
Tamarind 1 in Chalong has cheap booze, excellent food and is real friendly, also by the sea.
Ao Chalong Yacht Club has an excellent location right on the beach. Cheap booze, basic food and no women. The conversation gets pretty boring, but, that's a given when more than two yachties meet up.
If you want women, there are loads of bars in Rawai and Chalong, just don't expect the same quality as Patong.
Things are a lot cheaper and the Thais are a lot friendlier over on this side of the island.