For day tours from Las Vegas, plan early and choose your destination wisely—top picks include the Grand Canyon, Hoover Dam, Red Rock Canyon, and Valley of Fire. Book guided tours for convenience, especially if you want hotel pickup and expert narration. Bring water, snacks, sun protection, and wear comfortable shoes. Tours can last 4 to 12 hours, so check timing and weather conditions in advance. For less crowds, opt for early morning departures or go midweek.