Beginning divers learn underwater respiration with provided scuba great in an 18-foot, heated indoor pool

3.27-mi. course fraught with obstacles such as tunnels, mud crawls, and rope climbs challenges runners competing for glory and prizes

21 ft. Sun Tracker pontoon boat, 2011 Yamaha WaveRunner, or Sea Ray 185 Sport ski boat lets groups explore Joe Pool Lake's 7,500-acre area

Expert trainers guide students in basics of safety, horse maintenance, and riding in spacious covered arena

Scavenger-hunt-style race sends teams of two to four through downtown Dallas to compete for cash prizes and raise funds for St. Jude

Runners tackle a 5K mud course littered with more than 20 obstacles, refueling at watering stations and a post-race party with live music

After 30-minute ground briefing, skydivers ascend to at least 10,000 ft. & jump while strapped to pros, reaching speeds of up to 120 mph

Three-hour horseback trail rides through idyllic Texas pasture and woodlands, with a break for dinner

Instructors take a relaxed approach, using multimedia presentations to engage students before moving on to hands-on training

Up to seven passengers traverse scenic waters of Lake Ray Hubbard on spacious sport boat