Theres more FL'ers than there is in relation to Phuket in percentage terms (in Chaweng).. The BG's did not looks as cute as most in Patong and I tend to think there are more stunners in Patayya and BKK (but both places drive me nuts)..
If your young enough and like the discos 'pulling' in Soi green mango or the Reggae pub is like shooting fish in a barrel..
Otherwize there is a lot of Beer bars outside the reggae pub on the Rd in and another batch if you follow the Rd from Reggae pub into Chaweng over the dirt Rd / bad surfaced Rd bridge hang a left and follow it.. Some ok looking girls around and I am sure you could find someone to be happy with if you have the ability to look without getting caught by the first douyble bagger that grabs your arms.
Chaweng has 2 agogo's (the only ones on Samui I think) Dream girls at the left hand entrance to Soi Green Mango and GB Lounge further down and round the u bend of the soi.. I was impressed by the quality of the girls in Dream girls and they have ST rooms on site.. Bit pricy for ST but I had left my normal girl in Lamai at the salon and had only a VERY short time to tear around on a pussy hunt.
Lamai has lots of beer bars and quite a few FL's in super sub.. The quality of the BG's are lowish and you may want to get your beer goggles on.. Friendly enough and I am sure there are some to be found but not easy to grab a 8 or 9 er...
Lots of massage joints around and late at night many will 'go loom' for massage.. My buddy had the best of all his Samui experiences with a massage girl he grabbed at 2ish for a 'loom massage'... Check out the girls outside the piano bar massage on Chawengs main strip, no question about extras there
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Hope that helps.