When it comes to terrain, Miami's as flat as they come. A major bummer for anyone into climbing rocks. But luckily, there's X-treme Rock Climbing, where you can scale some serious walls in the comfort of A/C. This facility offers a whopping 14,000 square feet of climbing, so you'll hardly miss the mountains. Beginners can take an intro course where they'll learn the ins and outs of belaying - plus other optional classes like rock yoga, adventure racing and anchors 101. Private lessons are an option, too. And no need to go crazy buying all kinds of gear - you can rent everything you need. It's nice to get a little upward mobility in a town that's all about sea level.