Hi Girl,
The indoor/outdoor classification has mostly to do with the ability of the tile's bisque to absorb moisture and then break when used in freezing temps. I kinda doubt that'l happen in the Bahamas, even with the global cooling that has been going on for the past 8-10 years.
Another point is not using a super smooth surface than might be slippery when wet. Not knowing which tiles you bought that is the best answer I can give. Be aware that those stores specialize is selling real cheap quality tiles from China, Thailand, Brazil etc., and they may not wear as good as some others.
Be sure the prep and installation is done by someone that knows how, avaid "handymen" types. Or-----, may I come and install them?

Jaz