Dragon boat courses at Tsinghua will set you back a bit, and you will need your own dragon and your own boat. You can pick these up at your local xiaomaibu.
I suggest trying to set up a "dragon boating exchange" via the classifieds section of TBJ, or perhaps you could set something up on these webs. Young Chinese women are often quite eager to exchange dragon boating with foreigners who are looking to expand their knowledge of Chinese vaginas culture.
Eheheh. It's thebeijinger, try Googling that instead.
Come for the sickeningly desperate personal ads, stay for the reliable directory listings and occasionally decent feature articles.
And yes, their forum is an epic failure in nearly every way imaginable. Don't even bother.