Hi Joni. SanDee is correct in that cabana rentals are available only through the cruise line. Same goes for the clamshells. Half Moon Cay has been owned by Holland America Line (part of Carnival Corp.) for about 10 years, and many of my friends who sail HAL rave about the cabanas. BTW, HAL's website indicates that one clamshell covers two chairs, and the rental cost is per clamshell, not per person. I don't know if the same applies to Carnival.