Spas with reservation required

Valle de Bravo, State of Mexico

An adults-only luxury wellness retreat on the shore of Lake Avándaro in Valle de Bravo, built into a rock formation and run by reservation only.

Byron Bay, New South Wales

Hotel day spa at Crystalbrook Byron offering customizable massages and facials, open daily with Sunday by appointment only.

Lake Tahoe, California

A wellness studio in Tahoe City offering reiki, massage, meditation, sound healing and yoga classes, open daily from 9am to 7pm.

Napa Valley, California

A moderately priced day spa in Napa, open Tuesday through Saturday, 10am to 5pm, suited to solo visits or couples.

Encinitas, California

Adults-only day spa in Leucadia, Encinitas, about a mile from the beach, with private suites, a relaxation lounge and movement classes.

Palm Springs, California

Asian-style massage day spa in Palm Desert offering body massage, foot reflexology and acupressure, open daily 9am to 9pm.

San Diego, California

Day spa in Golden Hill, San Diego, specializing in organic facials, body treatments and waxing, with walk-ins welcome but reservations recommended.

Sedona, Arizona

Massage-therapist-owned day spa in Sedona offering tailored bodywork by appointment or walk-in, open daily 9am to 6pm.

Beitou, Taipei

A hot-spring resort in Beitou, Taipei with private suites, outdoor baths and overnight stays, open to day-pass visitors by reservation.

Washington, D.C., District of Columbia

A Dupont Circle-area day spa on Connecticut Avenue open daily into the evening, with both walk-in and reservation options.

Napa Valley, California

A downtown Napa day spa offering massages, facials, body treatments, waxing and nail services a short walk from the town's restaurants and hotels.

Gothenburg, Västra Götaland County

A hammam in Gothenburg's Olivedal district offering traditional oriental-style treatments, open daily from 9am to 10pm.

Fez, Fès-Meknès

A traditional hammam just inside Bab Boujloud in Fez's old medina, open daily from 11am to 8pm.

Maui, Hawaii

A nine-room resort spa on Maui's Road to Hana offering lomi lomi and lava-stone pōhaku wela massage, plus a eucalyptus steam room and cold plunge.

Hudson Valley, New York

A day spa in Rhinebeck Village offering skin and wellness treatments, with VIP memberships and walk-in availability by reservation.

Kapaau, Hawaii

An oceanfront eco-boutique hotel and wellness retreat on Hawaii Island's North Kohala coast, open to overnight guests only, not day visitors.

San Diego, California

A single-therapist day spa in Mira Mesa offering massage, facials, waxing and lash services, open Thursday through Saturday only.

Maui, Hawaii

A hillside day spa in Makawao specializing in traditional Hawaiian lomi lomi massage, open Tuesday through Sunday with reservations required.

North Royalton, Ohio

A North Royalton day spa built around a salt room and sauna, with adults-only halotherapy sessions on a walk-in or reserved basis.

Ojai, California

A day spa in downtown Ojai offering massage, facials and nail services, open daily from 11am to 6pm.

Miami, Florida

A day spa inside the Icon Brickell complex in Miami, open daily from 6am to 10pm, with both walk-in and reservation access.

San Francisco, California

A Korean day spa in San Francisco's Western Addition offering massages and skin treatments, open daily to adults and couples.

Key West, Florida

A moderately priced day spa on Whitehead Street in Key West offering massage and beauty services, open daily from 8am to 10pm.

Sun Valley, Idaho

Small Ketchum day spa offering facials, micro-dermabrasion, massage and reflexology by appointment only.