Not much! Key West is a super-laid back town and casual dress is perfectly acceptable at all our restaurants and bars, even the really exceptional ones. Flip flops are perfectly acceptable in basically every venue. We provide free use of pool towels and custom made sarongs, as well as we sell suntan lotions, sarongs, T-shirts, and ball caps. In winter, although warm by day, we do suggest you bring a light jacket or long sleeve attire, as the temperature in the evening can very occasionally reach the 60’s. If you are interested in snorkeling or diving, all of the boats provide the appropriate equipment.