Insty is back from the Cayman Islands, with scuba diving pictures. According to this page, there are three Cayman Islands (Grand Cayman, Cayman Brac, and Little Cayman), and the highest point is on Cayman Brac at a whopping 140' (one hundred and fourty feet) above sea level. This page says: "Rock climbing enthusiasts have touted the bluff as a great platform for sheer vertical cliff climbing." In fact, here are several articles about it. Hiking to the highest point doesn't seem to be too difficult. And, here's a recount of a 1938 biological expedition there.