If you dont want to fly, there are 2 water taxi services from Belize City. You could take a cab to the Marine Terminal or the Tourist Village and get on a boat, some of them are covered. They are very safe, I take a water taxi to SP or Belize City (from Caye Caulker) at least once a week. I fly about 1 time a month on Tropic Air (I recommend that carrier) and I still get butterflies. Either way the view is spectacular. (they havent killed me YET!)
--Silk
www.caribbean-colors