Considered to be the granddaddy of destination fitness resorts and spas, Rancho La Puerta dates back to 1940. Just an hour's drive from San Diego, California, it feels a world apart, set on 3,000 acres that include a celebrated cooking school and miles of hiking trails through meadows and mountainsides. The idea here is to give you a base for healthy living habits once you return home, and you can get started with nearly any kind of activity imaginable: Pilates, tennis, bar method, cooking, dream interpretation ... you name it, you'll probably find it here. Depending on your needs, you might take a nutrition class focused on reducing stress or attend a session on sleeping well. Balancing this out are classic spa treatments and seasonal cuisine showcasing ingredients from the resort's organic farm. The one-week program hosts 125 guests at a time, with arrivals and departures on Saturdays.