Trips with Baja Wild (Obregon at Guerrero. 624/172-6300. www.bajawild.com) include hikes to canyons, small waterfalls, hot springs, a fossil-rich area, and caves with rock paintings. You can also take customized jeep expedition trips to La Sierra de la Laguna, a series of mountain peaks submerged in water millions of years ago. The highest peak, at 7,000 feet above sea level, is ringed by pure pine forests. Rock-climbing and rappelling trips are also available. An all-day hiking trip includes lunch, guide, equipment, and transfer and goes for $98 per person.