Welcome to grotto-land, boys and girls! Both of these superb shore-diving sites feature grottos and caverns aplenty, and because of the shallow depths, you won't have to hurry home. Snorkelers will have a super time here, too. Access couldn't be easier. Eden Rock Diving Center can provide a map showing the underwater labyrinth. Divers should snorkel out to the buoys, then drop down and begin to explore. The caverns have plenty of light but bring a flashlight along to peer into all the crevices. Snorkelers can glide right over the caverns that divers explore and watch their bubbles escape from the Swiss cheese-like structures. You're likely to see schools of little silversides and shimmering silver tarpon.