We are going on a 7 night Western Cruise, first timers. We are scheduled to arrive at Key West at 12:30. My DH and DD want to do the thrill boat excursion. One of the times listed, through Disney's website, is 12:15? They would like to do the earliest time possible so they have the rest of the afternoon off, but how is 12:15 possible?? Would I be o.k. to just book it since it is through Disney?