Originally Posted By: Liquid_Turbo
Yellowstone National Park
-To see all the favorites, Old Faithful, sulphur pools, etc. Went there as a kid.
Grand Teton (Is it worth it to stop any where particular?)
Check out Jackson Lake Lodge in Grand Teton. There's a common room on the main floor with huge picture windows framing the Tetons. Sunrise is a good time for photos on the eastern shore of Jackson Lake--you'll get the light hitting the peaks and their reflections in the water. Access to the shore is easy from the Signal Mountain Lodge area.
If you plan to stay in Yellowstone and/or Grand Teton, be sure to make reservations early through the Park Service website. Rooms can be booked that way, and I think campsites as well. There's not much chance of pulling in and finding an open campsite inside the parks in July.
There's a crazy little section of road in SE Utah, Highway 261 that roughly connects Natural Bridges National Monument and the town of Mexican Hat, on the edge of Monument Valley. My atlas shows a little unpaved squiggle in the middle of a 20-mile stretch. That is a dirt road that feels like it corkscrews straight up the face of a mesa. I have only gone up, but the old wrecks off the side of the road suggest being very careful driving down.
Also, if you're going to the Moab area from the north, exit I-70 on Highway 128 instead of US 191. From Green River, UT, the exit is another 22 miles past US 191. From Grand Junction, CO, it is the first Moab exit. 128 is an awesome drive through the canyon of the Colorado, one of the most scenic roads I've ever driven. Don't drive like you're in a car commercial, though--you would probably hit a cow or somebody taking in the scenery. (If you don't go in that way, drive 128 north from Moab to Dewey Bridge and then turn around and go back to town.)