Photo: Courtesy of the property

Moana Surfrider, A Westin Resort & Spa, Honolulu

Why we love it: The Moana Lani Spa — where guests can see and hear the ocean from treatment rooms to lounges — is the only oceanfront spa in Waikiki. Here, you'll find a steam room, sauna, and whirlpool. Couples looking to enjoy some time together can book one of the oceanfront treatment suites, which boast beach views and private tubs.