Die Scoundrels played on one a Swan River cruise years ago.... some drunk dude fully ran down the boat and lept of the back!!!
We watched him swim to shore in the dark, freezing water. Crazy bastard!
Not a great idea though - apparently if they catch you (how?) they try to fine you $150 for dangerous behavior or some shit.
Music/metal cruises are the best.... except playing your instruments while drunk, and swaying with the boat is kinda a weird feeling!