Travelzoo offers a Sweetours Las Vegas Half-Day Hoover Dam Bus Tour for $49.99. That's a $21 savings and the best deal we could find. The tour lasts approximately six hours and includes unlimited bottled water. Reservations are required, and a $3 fuel surcharge applies. Book this travel deal by March 31 for tours through the same date.

Have more time to spare? Full-Day Grand Canyon Rim Tours are also on sale, with prices starting from $107.