The island and causeway are part of the Key West Naval Air Station. It is primarily used for Navy housing. It also includes a Navy Exchange, commissary, elementary school, marina, child development center, youth center, recreation center, RV park, and Sunset Lounge bar & grill. As a part of Naval Air Station Key West, there is restricted access and a valid military ID card is required to enter the Sigsbee Island complex.
The cache is not located on Sigsbee Island, but in a clump of mangroves on the shore of a small island west of Sigsbee Island. This cache is only accessible by boat. Do not look in the unofficial "camping" and "party" spots, it is not there!
The container is a small ID and money container with only a log. There is no room for any SWAG. BYOP
PLEASE! Put the container where you found it so it's not too easy to spot.