Sunstone Spa at Agua Caliente

Sunstone Spa is the spa wing of Agua Caliente's Rancho Mirage resort, built around a circuit of heat and water rooms rather than just treatment suites. A day pass gets access to the steam room, a dry sauna, halotherapy salt rooms, a whirlpool, a grounding room, a relaxation lounge, the fitness center and a private spa pool, so it works as a stand-alone soak-and-sweat day even without booking a massage or facial.

Beyond the wet areas, the spa runs a full treatment menu covering massages, facials, body scrubs and wraps, waxing, and hair and nail services, plus packages built for couples who want to book a treatment side by side. Reservations are required for treatments, and the day pass is the route in if all you want is the amenities.

It's open daily from 9am to 7pm, and the front desk can take calls in Armenian or Spanish in addition to English. Given the casino-resort setting on Bob Hope Drive in Rancho Mirage, this reads as a polished, mid-to-upper price hotel spa rather than a bare-bones bathhouse — plan for an upscale rate and book ahead, especially for weekend slots or couples treatments.