San Juan
Adults-only hotel spa inside La Concha Resort in Condado, San Juan, offering couples massages and a small treatment menu for guests 18 and up.
$$$
Hotel Spa
Spas inside hotels, many open to non-guests.
3 spas match
La Joya Sayulita
Hotel SpaSayulita, Nayarit
A hillside boutique hotel spa outside Sayulita with sauna, steam room, cold plunge and ocean-view pool, open on a day-pass basis.
$$$Farmhouse Inn
Hotel SpaCalistoga, California
A 25-room Sonoma hotel in Forestville with a spa barn offering sauna, steam and pools, mainly for overnight guests.
$$$$