Fisher Island, just off the tip of Miami Beach, is a tony enclave for the world’s uber-rich. Accessible only by ferry, private boat or helicopter, the 216-acre island offers residents privacy and security and has extensive amenities, including a private club, multiple dining venues, a luxurious spa, world-class tennis, golf course, private beach and beach club, a private day school and two marinas. It also has a grocery store, hotel and aviary with exotic birds.