Bahamas Cruise Vacation 2008

This is the trip of a lifetime for me and my Mother. Although I traveled all over the US as a child, I have not been outside the Continental US. My Mother and I are both disabled. We both have meager incomes from disability and could not possibly afford to go on such a trip if it were not for my older brother. He is paying for our flights, the Cruise itself, our Motel Accomadations and is even throwing in a little spending money. He wanted Mom to have this trip and I am going along to help care for Her. We will have to be very frugal and I intend to take advantage of anything that is "free". We will be flying into Orlando a day early and staying over a day after the Cruise. Any suggestions as to what to do would be most appreciated.