TrustedReviews check out the Pentax Optio Wpi and report-

“On the whole though, not a bad performance. The Pentax Optio WPi is the only fully waterproof 6MP compact on the market, and it is ideal for any sort of outdoor activity short of serious SCUBA diving. It is also an ideal social camera for its sheer indestructibility and excellent low-light performance, plus if some idiot spills beer all over it you can just rinse it off under a tap.”