Summer is Jackson's busy season. The National Parks are open, the wild flowers are blooming and the weather is mild. Whether you are a biker, climber, kayaker, rafter, backpacker, runner, paraglider, hunter or somebody who just likes to stroll in nature, Jackson is a wonderful place to be. If you like to climb, you've come to the right place.If you've got a head for heights or want to cultivate one, arrange for a guided ascent of 13,772-foot Grand Teton with Jackson Hole Mountain Guides (800-239-7642; http://www.jhmg.com) or Exum Mountain Guides (307-733-2297; http://www.exumguides.com), providers of mountain adventures for beginning, intermediate, and advanced climbers. All ages can enjoy the centrally located Climbing Wall, structured with a variety of climbs from easy routes for first-timers, to complex problems for more experienced climbers. Once you master the wall, arrange an outing with a JHMR Adventure Guide to explore new terrain and improve your skills on the mountain.