Ambition is rarely lacking in reality TV contestants, and even less so, camera-ready good looks or a polarizing personality. Denver’s Ken McNickle, who was once named by Cosmopolitan magazine as Hawaii’s most eligible bachelor when he lived in Maui, has all of those things. The 33-year-old Wamego, Kan., native has worked as an underwear model and massage therapist, which makes him a not-so-surprising choice for a castaway on the 33rd season of the CBS reality show “Survivor,” which debuts on Sept.