It will not be hard to make you fantasy of a Thai Boxer come true. I like the boxing at the old Marine Bar in the middle of Walking Street. Be sure to bring a bunch of 20 baht with you, after every bout the guys will expect something. It is still a cheap night out. It all starts about 9:30 and is over by midnight. If a tour bus group pulls in, they make up the lion share of the crowd. I do hope you enjoy your time with a boxer and with the gals who serve your table. You will be assaulted by several gals as you enter. I suggest you get a table by the pool table. The guys like to play pool and it is a good place to watch the boxing too.