Spas with reservation required in Mexico

Mexico City, Quintana Roo

A Japanese-style hotel spa in Mexico City's Cuauhtémoc district with tatami suites, outdoor onsen baths and a $2,080 day pass for couples.

Oaxaca

A traditional four-door temazcal steam ceremony about 15-20 minutes outside Oaxaca city, paired with an ice-water plunge and overnight rooms.

Tulum, Quintana Roo

A hotel spa in Tulum's SM 15 area that requires advance reservations and is geared toward couples and small groups, priced in the upscale range.