9. Jupiter, Florida

Hundreds of rare loggerhead turtles know a paradise when they find one. Juno Beach, a white strand of sand along the southern Florida coast, is one of their favorite nesting places. Just north of that beach sits Jupiter, a relaxed beachfront town with 40,000 year-round residents who've chosen to nest along this network of inlets and waterways.

Life in Jupiter is easygoing and low-key, and yet there's access to plenty of luxury amenities, whether you're a visitor or a resident. On the down-home front, baseball devotees love the proximity to spring training—both the St. Louis Cardinals and Miami Marlins train and play at Jupiter's Roger Dean Stadium. And tying it all together are those lovely Florida Atlantic coast beaches—long, broad, and ranked consistently among the healthiest beaches on our list.

Where to Stay: Jupiter Beach Resort is nestled on 1,000 feet of sandy shore. Rates start at $181; 866/943-0950 or jupiterbeachresort.com.