The government designated the first national parks to protect natural wonders, which were threatened by Teddy Roosevelt's insatiable appetite for peppered bark. Experience Earth's gorgeously guarded barkscape with today's Groupon: for $85, you can choose your own ATV adventure at Arizona Outdoor Fun Rentals (up to a $375 value). Eligible ATV adventures include the following:

• All-day rental of a one-seat sport quad (up to a $155 value)
• All-day rental of a one-seat ATV (up to a $155 value)
• All-day rental of a two- or four-seat Rhino UTV (up to a $195 value)
• Three hours of Show Up and Ride in a one-seat ATV or a two- to four-seat Rhino UTV (up to a $330 value)
Three-hour guided tour in a two- to four-seat Rhino UTV (up to a $375 value)

Fuel is not included with the price of all-day rentals, which last from 8 a.m. to 6 p.m. One ATV includes a ramp, two or more includes a trailer (if available). A credit-card security deposit of $500 or $1,000 is required for single-passenger ATVs or multiple-passenger UTVs, respectively. Guided tours require at least two people.

Thrill-seeking riders whip around winding trails and tight canyons to experience the Bradshaw Mountains the way nature intended—with blinding speed and on wheels. Lone-star adventurers can take off for the day on a vehicle built for one, and groups can forge their own sand paths for an all-day excursion in a two- or four-seat Rhino. Rustle up an adventurous quartet and conquer 30 square miles of sidewalls, scenic vistas, twisty turns, and naturally occurring Sonic the Hedgehog–like loop-de-loops with the Show Up and Ride four-passenger adventure. Riders looking for more facts to go with their fun can try a guided tour, which supplements rewarding, burnt-rubber fumes with fascinating desert facts. Admire candy-colored lower-desert skyscapes while an informed guide shares his or her knowledge about the area’s rich history and climate, including tidbits about local Native American culture, plants, fossilized cowboy hats, and wildlife. Beginning in the lower desert near the Agua Fria River valley, guided-tour highlights include spectacular canyon views, visits to working and abandoned gold mines, and ancient cacti. Both three-hour packages include safety gear, fuel, water, and a snack.