The Standard Spa, Miami Beach

The Standard Spa sits on Belle Isle in the Venetian Islands, a short hop from the South Beach strip but set apart in its own tropical garden grounds. It operates more as a spa with rooms attached than a conventional hotel, and the property is adults-only, with a minimum age of 18.

The hydrotherapy circuit is the main draw: a Turkish-style hammam, an aroma steam room, a hemlock sauna and an ice room sit alongside water features that include an infinity pool, a Roman waterfall hot tub, an arctic plunge, treatment baths and a Falling Water Column. The idea is communal bathing in the old tradition — moving between hot, cold and steam rather than booking a single treatment and leaving.

Stays here come with rooms featuring private terraces, rain showers and, in some categories, outdoor soaking tubs or semiprivate terraces opening onto the hydrotherapy area. On site there's also Lido Bayside Grill, a café, a gym, a boutique, a nail salon and an indoor bar, so a day here can stretch well beyond the spa circuit itself.

Access is generally tied to being a hotel guest, though a day pass is listed as available, so anyone without a room booked should call ahead to confirm current terms, pricing and whether the full facility is open to day visitors. This is a luxury-tier property, and hours for the spa circuit should also be confirmed directly, since published scheduling is limited.