Lanai , Hawaii
Concierge.com's insider take:
This perfect white-sand swath just west of Manele Bay has rocky tide pools and a marine preserve (on the beach's eastern side). Hulopoe is known for its clear, aquamarine waters and exceptional snorkeling and swimming. Thanks to the island's relative isolation and a small human population, Lanai's coral reefs are thriving with parrot fish, sea stars, Barber pole shrimp, and limpets; spinner dolphins and humpback whales have also been known to make guest appearances. On calm days, you can spend all day snorkeling. When there's a swell, check out the small pods of talented local surfers tackling the wickedly challenging shorebreak.