Concierge.com's insider take:

Key Biscayne is barely Miami at all—at least in atmosphere. The island—a bridge span from downtown—is a quiet, moneyed hideout, where starched uniform–sporting nannies wheel their charges along manicured sidewalks. No wonder, then, that the Ritz-Carlton here is equally lush and family-friendly. Set back from the main road, and part of a larger condo development, its 400-plus rooms, many overlooking the ocean, are huge and filled with overstuffed, classic Ritz furniture. There's a roomy spa and several first-class restaurants on the premises, from the rustic Tuscan Cioppino to a Havana-style rum bar overseen by a rum sommelier to a burger lounge on the sand. Of the two pools, the large southern one is for families, and the smaller northern one serves cocktails and loans iPods. The on-site tennis center is a nod to Key Biscayne's obsession with the sport. Given Florida's iffy weather, staying at a Ritz is comforting in hurricane season: If a storm bears down, the hotel will transport all guests (without charge) to another hotel somewhere in Florida to finish out their vacation.