Has anyone booked the Private Sail in Grand Cayman through Grand Cayman Cruise Shore Excursions? I am looking at a 6 hour private excursion for up to 5 passangers on a 22 foot sailboat (with a captain). Cost is only $500....sounds like it may be too good to be true (I would have expected it to cost more). Actual name of the excursion is listed at Grand Cayman Snorkeling & Sailing and Beach Private Adventure Tour (captain is John Michael Stafford). Any feedback is appreciated.