Spas with overnight stay

San Diego, California

A hotel spa on Mission Bay in San Diego with sauna, steam room, cold plunge and thermal pools, open only to resort guests.

Calistoga, California

Resort spa at an Auberge Collection hotel in Calistoga with a thermal pool, open to hotel guests only.

Chiang Mai, Northern Thailand

A hotel spa inside the Four Seasons Resort Chiang Mai in Mae Rim, with sauna, steam room, cold plunge and thermal pools set among rice paddies, open to resort

Abano Terme, Veneto

A family-run thermal spa complex in Abano Terme with two hotels, thermal pools, mud therapy and a day-pass option for non-guests.

Penang

An adults-only villa resort spa near Kepala Batas, Penang, with 18 private villas, spa treatments and plant-based dining; reservation required.

Mykonos, South Aegean

A hotel spa inside Cavo Tagoo Mykonos, open only to guests staying at this luxury resort overlooking the Aegean.

Ein Bokek, Southern District

A large hotel resort spa in Ein Bokek with two spa facilities, a thermal pool and 606 rooms overlooking the Dead Sea, open to hotel guests only.

Puerto Vallarta, Jalisco

A resort spa inside the all-inclusive Dreams Bahia Mita Surf & Spa Resort on Banderas Bay near Punta de Mita, open to hotel guests only.

Mazatlán, Sinaloa

Hotel spa at an all-inclusive beach resort in Mazatlán, offering a hydrotherapy circuit, Hammam and massage treatments for registered guests only.

Tulum, Quintana Roo

Resort spa at an all-inclusive Tulum beach hotel, with hydrotherapy, jungle and beach-side treatment cabins, open to hotel guests only.

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.

Houston, Texas

A hotel spa inside the 30-storey Four Seasons in downtown Houston, with rooftop pool access, open only to hotel guests.

Philadelphia, Pennsylvania

A hotel spa inside the Four Seasons Comcast Center tower in Center City Philadelphia, open to overnight guests with an infinity pool and skyline views.

Palm Beach, Florida

Oceanfront resort spa at the Four Seasons Palm Beach, open to hotel guests only, with thermal pool, relaxation lounge and ocean-view pool deck.

Scottsdale, Arizona

A hotel-guests-only resort spa at the foot of Pinnacle Peak in Scottsdale, with a bi-level pool, hot tub and Southwest-inspired treatments.

Jackson Hole, Wyoming

A hotel spa at the Four Seasons Jackson Hole in Teton Village, open to resort guests for private suite treatments.

Calistoga, California

A hotel-guests-only resort spa at Four Seasons Napa Valley in Calistoga, set inside a working vineyard property with a pool and on-site restaurant.

Atami, Shizuoka

A hotel spa in Atami with a thermal onsen pool, open only to overnight guests staying at Fufu Atami.

Sint Eustatius

A 40-acre dive-and-stay resort on Sint Eustatius with a pool, restaurant and shuttle service to its dive center, open only to overnight guests.

Scarborough

A boutique hillside hotel above Bacolet Bay in Scarborough, Tobago, with an infinity pool and ocean views, built around a converted 150-year-old Donkey Cart

West Bay, Bay Islands Department

A beachfront resort spa on Roatán's West Bay Beach with a hydrotherapy circuit, thermal pool and ocean views, open only to hotel guests.

Austin, Texas

A lakeside resort spa on Lake Travis in Lakeway, Texas, with pools, outdoor baths and treatments, open only to hotel guests.

Naples, Florida

A Four Seasons resort spa on Naples' Gulf Coast, open to hotel guests for treatments, pool time and fitness facilities.

Palm Beach, Florida

A 40,000-square-foot spa inside PGA National Resort in Palm Beach Gardens, open to hotel guests as part of a golf-and-wellness stay.