Hotel Spa

Calistoga, California

A 25-room Sonoma hotel in Forestville with a spa barn offering sauna, steam and pools, mainly for overnight guests.

San Diego, California

Hotel spa on Shelter Island in San Diego with sauna, steam room, and pool, open to guests staying at Kona Kai Resort.

Warwick, Rhode Island

A boutique Hilton hotel in a converted Warwick textile mill offering guests a sauna and fitness center, with no public day-spa access.

Scottsdale, Arizona

A hotel spa at the 65-acre Fairmont Scottsdale Princess resort in North Scottsdale, open to overnight guests with sauna, steam room and pool access.

Denver, Colorado

Hotel spa inside the Four Seasons Denver, open to hotel guests only, with treatment rooms, sauna and a fitness center in the Central Business District.

Seattle, Washington

A hotel spa inside the Four Seasons Seattle, open only to hotel guests, with Elliott Bay views and an on-site fitness center.

Huntington Beach, California

An adults-only hydrotherapy circuit with hot tub, sauna and steam room for guests staying at this beachfront Hyatt Regency resort in Huntington Beach.

Muscat

A hotel spa inside Kempinski Hotel Muscat offering massages, facials, body treatments and a fitness center, open to hotel guests only.

Sopot, Pomerania

Hotel spa in Sopot open daily 9am–8pm, with a day pass option for non-guests and a fitness center on site.

New York City, New York

Sisley Paris spa inside The Dominick, a five-star SoHo hotel, open to hotel guests only with a rooftop pool, fitness center and lounge.

Big Sur, California

Adults-only hotel spa at Ventana Big Sur with ocean-view treatment rooms, outdoor cabanas for couples, and a 24-hour fitness and yoga space.

San Francisco, California

A moderately priced fitness-club spa in downtown San Francisco offering bodywork, skincare and specialty treatments with reservations required.