Southern Utah, Arches National Park, Canyonlands, Lake Powell, Goblin Valley, Capital Reef, and the San Rafael Swell. These were the inspiration for the Spaceman Spiff comics in Calvin and Hobbes. If you can take out a PWC on Lake Powell you can find slot canyons and drive in caves, cliffs for jumping from and 100 foot cliffs of painted rock. And if you go to the right place you find yourself in what seems to be a giant conch shell buried vertically in the sand with a little beach inside. The official maps call it Margaritaville. The goblins of Goblin Valley make the worlds greatest natural paintball arena though paintballing is not allowed airsoft is fun. Canyonlands is upriver of the Grand Canyon an offers a great vista of the curvature of the earth. If you want to see real petroglyphs, Capital Reef has them. As for the San Rafael Swell, it has to be seen to be believed. It is like a giant wave, the size of a mountain range, was turned to stone just as it was crashing ashore. For a quick taste, drive I-70 east to west in the morning, this will remind you of the freeway scene in Cars where the road made you miss the beautiful terrain by cutting right through it.