Grove Isle Hotel & Spa: This low-key hotel just off of Coconut Grove not only has an awesome spa in totally zen surroundings--it has a Watsu pool. This treatment--where a therapist basically massages you while you're both in a warm pool--is hard to find and this is one of the few in Florida. It's not included on the Spa Month menu but it's a good excuse to get you there to check it out.
Casa Moderna Miami: The spa here is fresh from a little makeover that took place just as the hotel made its transition from Tempo Miami to Casa Moderna. Nothing beats a brand new spa for feeling brand new yourself.
The Ritz-Carlton, Coconut Grove: Another spa that just had its own refresh, this one is worth visiting for its intimacy and quiet. Their Spa Month choices include a pedicure--a summer essential--and a Mimosa Body Treatment with Massage. Mmmm.
Acqualina Resort & Spa: While it's located up in Sunny Isles, which is not always convenient if you're staying in South Beach, this ESPA spa gets our vote as one of the most luxurious spots in town. They do amazing facials and, good news for dudes, a men's facial is part of the Spa Month menu.
[Photos: HotelChatter, inset: Grove Isle Hotel & Spa]