Honeymoon Question... Where to go Carribean or Hawaii?

My fiance and i are getting married in march of 09. For our honeymoon, his family wants us to use their marriott timeshare. With that said, it limits the locations we can look at. I have always dreamed of going to the atlantis hotel however, that is not doable. With that in mind, we are currently looking at st. thomas or hawaii? St. thomas seems beautiful and have been told that it is amazing. But i have a fear of reptiles and i have heard that the reptiles are pretty prevalent there. Along with that, the cruises seem to have that being one of their biggest stops. The other option is hawaii probably kaui and then either maui or oahu... Love these places but it isn't as "exoctic" as the others and seems a little "ordinary"... Any thoughts? I am very confused and feel that we need to make a decision soon... HELPP!!! I know the right spot is out there but i just can't seem to find it within our perameters...