Some 500 people in Baltimore dared to take a three-hour tour with Bob Denver and didn't end up marooned on Gilligan's Island. The trip last week around Baltimore Harbor was part of a "Gilligan's Island" reunion sponsored by a radio station and also featured Russell Johnson, who played the professor, and Dawn Wells, who was Mary Ann on the 1960s sitcom. "The show was simple, innocent, and had a lot of slapstick," said Denver, 55, who wore his trademark tennis hat and striped shirt. "It has been so popular so long because kids see it today and say Gilligan is just like them."