bryan tree i think is the one behind esplanade @ ratchada...
this is more of a thai place with very few farangs.
just beside bryan tree , got another place called INCH, play different music but also mostly thai crowd.
hooking up at such places ( RCA, thonglor etc) will depend on luck
and of course, you must have some substance.
take note, most of the girls there go in a all gals grp or with mix grp, so not easy to hook up as the guys can get overly-protective.
CM2 is purely p4p and you do get the occasional stunners or so called uni gal there to earn some spare cash. the rest like spicy, bossy are basically the same concept. they open till late, and i will say most of the gals there are WL.
another place to try is Tunnel which i understand had its re-opening just this month. probably paid off the police enough. go to this place while its still happening. tunnel has a good mix of FL + girls out to have fun. higher chance to get lucky here vs bryan tree / RCA .
of cos there are lots of things to try in the p4p scene .
ie poisedon, soi cowoy, nana, patpong , karaoke, G-club .
hope this helps