I personally have seen one episode of "Temptation Island" and I refuse to watch it on the belief that it is EVIL! Ok, it might be somewhat entertaining to watch people cheat on their boyfriends/girlfriends, but I'm convinced that they are all going to you-know-where.
Anyway. If you're looking for romance on Ambergris Caye, the surroundings are perfect but San Pedro isn't full of single tourists like some other travel spots. The locals are very friendly, however, and my friends and I met several interesting young men.
The "Barefoot Iguana" and "Tarzan's" are two nightclubs on the island -- Tarzan's is in San Pedro and the Barefoot Iguana is south of the Yacht Club. If you feel like dancing, these are the hotspots.