Spas with reservation required

Miami, Florida

A medical spa in Brickell, Miami, open Tuesday through Saturday with reservations recommended for adults-only treatments.

Krabi

A moderately priced onsen-style day spa in Ao Nang, Krabi, open daily from late morning into the night.

Philadelphia, Pennsylvania

A reservation-only day spa in Blue Bell, just outside Philadelphia, with moderate pricing and adults-only access.

Calistoga, California

MoonAcre Spa & Baths is a day spa in Calistoga with a thermal pool, hot tub and sauna, open daily 9am–5pm and geared toward families and couples.

Marrakech, Marrakesh-Safi

An adults-only destination spa and wellness retreat on the Ourika road outside Marrakech, currently taking names for a waitlist.

Napa Valley, California

A hotel spa at the Napa Valley Marriott Resort, open to hotel guests by reservation, geared toward couples and families.

Hot Springs, Arkansas

A moderate-priced day spa in downtown Hot Springs open daily 9am to 10pm, offering massage services to adults only.

Hot Springs, Arkansas

A moderate-priced day spa at 328 Central Ave in Hot Springs National Park, open Tuesday through Saturday with hours that vary by day.

Bartlett, Tennessee

An appointment-only luxury day spa in Bartlett Station, Memphis, with service packages priced up to several thousand dollars.

Pucón, Araucanía

Pangue SPA is an adults-only day spa in central Pucón, open daily 9am–9pm with moderate pricing and reservations advised.

Boulder, Colorado

Pure Serenity Spa is a moderate-priced day spa in Boulder open Sundays, with reservations recommended for couples or solo visits.

Palm Beach, Florida

A moderately priced day spa in West Palm Beach's Palm Beach Lakes area, open daily except Sunday from 9am to 10pm.

San Francisco, California

Day spa in San Francisco's Union Square, open daily 10am-8pm, moderate prices, walk-ins welcome but reservations required.

Ixtapan de la Sal, State of Mexico

A moderately priced day spa in the Santa Ana neighborhood of Ixtapan de la Sal, open daily and welcoming families.

Tampere, Pirkanmaa

A budget-friendly public sauna and bathhouse in Tampere, open to walk-ins but reservations are also an option.

Ixtapan de la Sal, State of Mexico

A moderately priced day spa in Ixtapan de la Sal open daily 9am–6pm, with walk-ins welcome but reservations required.

Sun Valley, Idaho

A family-owned medical spa in Ketchum, Idaho, offering skin and wellness treatments since 2008, with walk-ins welcome but reservations recommended.

Boston, Massachusetts

A downtown Boston day spa at 1 Devonshire Pl offering massage and wellness treatments for solo visitors and couples.

Bad Blumau, Styria

Rogner Bad Blumau is a Hundertwasser-designed thermal resort in Styria with geothermal pools, outdoor baths and hotel-guest-only access.

Medellín, Antioquia

A couples-focused day spa in El Poblado, Medellín, open daily 9am to 7pm with moderate pricing.

Kansas City, Missouri

A hotel spa inside the Westin Kansas City at Crown Center, open to hotel guests by reservation in downtown Kansas City.

Jackson Hole, Wyoming

Adults-only day spa inside the Teton Club in Teton Village, Jackson Hole, offering personalized treatments by reservation.

Yalova

A budget-friendly adults-only hammam in Yalova Merkez open daily from noon to midnight, with walk-ins accepted but reservations required.

Yufuin, Oita

A small hillside ryokan near Yufuin's town center where every room has its own half-open-air bath filled with 100% source hot-spring water and a view of Mt.