Step through the fortified iron door into the blast-hardened tunnel and you're inside the bomb shelter built in 1961 to protect President John F. Kennedy during the Cuban Missile Crisis. The bunker is on Peanut Island, reachable only by boat. Details: Tours are 11 a.m.-4 p.m. Thursday-Sunday; arrive via private boat or water taxi, available from the Riviera Beach and Sailfish marinas. Visit the Palm Beach Maritime Museum at Currie Park, 2400 N. Flagler Drive, West Palm Beach; 561-848-2960; 561-723-2028, PBMM.org. Tickets: $12 for adults, $10 for seniors, $6 students; $10 for round-trip water taxi service from Riviera Beach Marina and Sailfish Marina. Boat trip by appointment at Currie Park.