Green Mango, my opinion, young groups of kids mostly now.
Even the thai ladies seem to be avoiding that bar a bit now.
Too many lady boys for my liking
music has not changed in over 2 years, but if your new, it wont matter that much really. I just find green mango to be too many 20-25ish year old young punks looking for problems, and of course they find it easy.
Raggae pub, is a bit older group and more laid back with many FL's, best to arrive after 11pm as its quite till then, music various.
Solo, its the place all go after 2-3am, hit and miss each night.
Q-bar, over prived 270 baht per drinks and 300+ for other.
supersub, after 12am, great place with nice mix of westerners and thais. WARNING: thai studs dont like you trying to pick up the gals they are sitting with. use your brain.
The Club, newest bar in Lamai, actualy just before lamai, same style as The Club on kho sarn (spelling) road.
FullMoon party. worth the 1 time to see and live. 1 time was enough for this old dog, seems to be a few fights over nothing, long waits for rides on boats back home.
Halfmoon at lake view, 100b just to get into it, 20baht to park ya bike.
Not even worth the time to go there, even the thais avoid it now. Plus rainy season makes it a bore.
If you want more info on the local bar scenes, give me a pm, ill fill you in.
cheers