shell island is in pcb and costs about 10$ to get there and back, but you can stay as long as you want
i haven't been on it in probably 30 years, but it was 'just ok' back then and really wasn't worth getting off the boat which was cool and had a glass bottom so you could see the cool sea grass, tubeworms, fish and crabs on the bottom
the island lost a bit of height during the hurricanes, and the one and only structure (bathrooms) blew into the bay
no trails or bathhouse or bathrooms or shade or camping
lots of snakes and the biggest spiders you ever saw are up in the woods on the high west end of the island by the pass
used to have a lot of shells until captain anderson started running 30+ folks out there every two hours, then the shell island shuttle got a bunch of money during the 1996 olympics and at least one shell island shuttle has been making 15 minute runs from st andrews state park for the last few years
you'll probably find more shells at the jetties in st andrews state park waiting for the shuttle to come
usually one person a year gets fried by lightning on the east end of the island at weakfish point
unless you are a hardy beach comber i'd say avoid it cause that's all there is