Accessible only by boat, the main part of this park protects 6 sq miles of reef in the Atlantic Ocean just off Jupiter Island. Twelve species of hard and soft coral inhabit the reef, so anchor on the sandy bottom. Snorkeling and scuba diving are permitted; depths range from 5ft to 35ft. Complementing the 2.7 miles of beaches are toilets and running water, piers and hiking trails. From the mainland at the eastern end of Cove Rd, a 3300ft boardwalk runs from dock to beach.