Ocean waves lap against the white-sand lagoon along Oahu’s western shore, where palm fronds wave in the breeze and lush flowers bloom. This oasis sets the stage for the JW Marriott Ihilani, whose spa believes that the sea can heal and rejuvenate both body and soul. This philosophy leads to a bevy of tropical, ocean-inspired treatments: fresh Hawaiian seawater flows through water jets during a thalasso massage, Hawaiian ti leaves soothe skin in a wrap, and liquid-calcium seaweed pearls add luxury to facials. Even fitness sessions place guests right on the beach so they can jog in the ocean or do bicep curls with pineapples. Water and steam also ease tension in the sauna, steam room, and a Roman pool, whose artistic tile work evokes the empire.

The spa’s other elegant decor, accented by vases of flowers and fronds etched into glass or tiled into mosaics, subtly reflects the surrounding tropical paradise. Guests lounge amid the marble countertops and pristine white stone while wearing plush robes. While at the spa, they can also visit the full-service salon for quick blowouts or join a yoga class to prepare for their pretzel Halloween costumes.