Passage Key, also known as Naked Island is about a mile from the Skyway Bridge, just off Anna Maria Island. What was once a small sand island that would disappear at high tide has recently (last couple of years) become a beautiful exposed sand island with some new growth vegetation.
It still is the popular place for boaters that opt for a clothing optional (why it's called Naked Island) area for socializing. Because of its small size and importance to wildlife, the refuge is closed to all public use. No people allowed on the actual beach, as it is a protected bird sanctuary, so please note that you must stay in the waters off the shores. Most folks anchor their boats and socialize in knee- to waist-deep water anyway... On any given weekend you can find 100+ boats! It's a ton of fun for the open minded and those that don't get offended by social nudity.
*Please note that the nudity is not technically permitted in Pinellas/Manattee counties, however, even though this area is routinely patrolled by the Sheriff's Office, Fish and Game Officers, and the Coast Guard, they don't seem to have an issue with the nudity as long as it remains non-sexual.