Getty Mexico's Riviera Maya has actually been changed over the years from a sleepy backwater into a first-rate getaway location. And together with the tourist growth, mobile experts and digital nomads have actually flooded to towns like Playa del Carmen and Tulum. "Tulum has cornered the market for being eco-chic," says McMahon.

It's as trendy a location as St. Barts, St. Tropez and the Greek island of Mykonos." Till now, a 1,000-square-foot oceanfront condominium in Playa del Carmen…