“Gilligan’s Island” actress Dawn Wells is coming to Brevard. And not just “for a three-hour tour. A three-hour tour.” Wells, who played Mary Ann Summers in the 1960s situation comedy — seven strangers stuck on a deserted island — will be the featured celebrity at the Ron Jon Cocoa Beach Half Marathon, organizer Mitch Varnes says. It’s scheduled for Oct. 23. During last year’s inaugural race, “I Dream of Jeannie” star Barbara Eden was the main attraction. Incidentally, the race ended at Lori Wilson Park on I Dream of Jeannie Lane.