never tried it, but there's stripers in emeryville in the summer, the very odd butt, dunno if you can do it though, i don't see why not. i posted something a long time ago about tubing the bay, check the archives, dunno if its here or the the float tubing forum. personally i think chrissy field would be a good idea in late spring/summer for butts. but i would be affraid of getting caught in the out going tide and ending up at the islands...