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.
$$$
Hotel Spa
Spas inside hotels, many open to non-guests.
3 spas match
Miami Marriott Biscayne Bay
Hotel SpaMiami, Florida
Hotel spa deck in downtown Miami with sauna, steam room, cold plunge and thermal pools overlooking Biscayne Bay, day passes from $50.
$La Joya Sayulita
Hotel SpaSayulita, Nayarit
A hillside boutique hotel spa outside Sayulita with sauna, steam room, cold plunge and ocean-view pool, open on a day-pass basis.
$$$
