Catalina Caper (also known as Never Steal Anything Wet) is a 1967 comedy musical mystery film starring Tommy Kirk. It is one of the last (if not the last) in the beach party film genre. This entry blends the beach format with a standard crime-caper comedy. It was shot in and around Santa Catalina Island, California. (Wikipedia)
http://cinematicdiversions.com/mystery-science-theater-3000-ep-204-catalina-caper-1967-review/
