Los Angeles, California
Four Seasons hotel spa in Beverly Hills with a steam room, rooftop pool, fitness center and eight treatments, open daily, day passes available.
$$$$
Spas with outdoor baths
2 spas match
Sage Hill Inn & Spa
Hotel SpaKyle, Texas
A 88-acre Hill Country resort near Kyle and Wimberley with overnight rooms, a garden spa, pool, hot tubs and day-pass access by reservation.
$$$