Originally Posted by phedge

If you're heading as far as Arizona I'd highly suggest a Arizona, Utah loop. You could hit Grand Canyon, Petrified Forest, Monument Valley, Arches, Canyon Lands, Capitol Reef, Boulder, Escalante, Bryce Canyon and Zion NP in a comfortable 3-4 week time frame. You can easily mix in some fabulous cycling along that route to break things up. We took 23 days for that trip and didn't feel rushed. Of course we could have spent twice that, but that time gave us the most memorable trip we've ever had.