Spas with solo travelers

Carmel, Indiana

A no-frills contrast therapy studio in Carmel, Indiana, built around a 30-minute sauna-and-cold-plunge circuit for solo visitors.

Dallas, Texas

A no-frills massage studio in North Dallas offering Swedish, deep tissue and its own signature treatment, plus in-home and office visits by appointment.

San Diego, California

Independent massage studio in San Diego's Little Italy offering therapeutic bodywork, hot stone and couples treatments since 2009.

Denver, Colorado

Walk-in day spa in Denver's Golden Triangle offering massage, facials and couples treatments, open most weekdays until 9pm.

Carmel-by-the-Sea, California

A Monterey day spa open since 1999, offering massage, facials, waxing and skin treatments with reservations recommended daily from 9 to 5.

Las Vegas, Nevada

A no-frills massage and facial day spa on West Flamingo Road in Las Vegas, open daily 10am to 8pm with walk-in and reservation options.

Naples, Florida

Medical spa in North Naples focused on injectables, facials, peels and skin-resurfacing treatments like Morpheus and Votiva.

South Jordan, Utah

A day spa and wellness center in South Jordan, Utah, with a salt room, infrared sauna, cold plunge, float therapy and a yoga studio.

San Diego, California

Neighborhood day spa in Mission Hills offering massage, facials, acupuncture and waxing, with couples treatments and walk-in or booked visits.

Ubud, Bali

An adults-only wellness retreat on Ubud's Ayung River offering multi-day healing programmes, thermal circuits and plant-based cuisine by reservation only.

Nashville, Tennessee

Float Horizen is a day spa in Nashville's East End offering sensory-deprivation float tanks, infrared sauna, massage and sound meditation sessions.

Key West, Florida

A day spa just off Duval Street in Key West offering massage, facials, waxing and a Vichy shower, with walk-ins possible but reservations preferred.

Tucson, Arizona

Day spa in Tucson's La Encantada shopping center with a thermal circuit of sauna, steam room, cold plunge and soaking pools.

Asheville, North Carolina

A West Asheville day spa offering massages, facials and lymphatic therapy, with walk-ins welcome and reservations recommended.

Tokyo

Private-room head spa salon in Minami-Aoyama, Omotesando, offering 90- to 210-minute scalp treatments from roughly ¥24,750.

Mérida, Yucatán

Resort spa on the grounds of Hacienda Xcanatun near Mérida, with a pavilion over a pond offering Asian-style massages and facials by reservation.

New York City, New York

A Financial District day spa on Greenwich Street offering private-room facials, massage and body treatments, open daily with walk-ins and reservations.

San Francisco, California

A Mission District day spa in San Francisco focused on massage and facials, founded by massage therapist Candace Combs.

Ojai, California

A small facial studio in Ojai run by esthetician Allison, offering customized facials, RF skin tightening, microcurrent and waxing by reservation.

Hudson Valley, New York

A moderate-priced day spa in Cornwall-on-Hudson offering massage, facials, laser treatments and waxing, open most days with both walk-in and reservation

Zurich

An upscale day spa near Paradeplatz in central Zurich focused on facials, anti-aging treatments and massages for adults.

Miami, Florida

Medical spa inside the SLS LUX Hotel in Brickell offering massage, custom facials and couples treatments by reservation.

Washington, D.C., District of Columbia

A Washington, D.C. day spa focused on scalp treatments, massage and lymphatic drainage, open daily 9:30am to 10pm with walk-ins accepted.

Baños, Tungurahua

Day spa in Baños with 46 treatments, 11 themed rooms, and skincare made from garden-grown herbs, fruit and volcanic ash.