Detroit to Tucson...three weeks...?

Well we have gone from Northern Michigan to the southwest twice with an RV and once by car. Slightly different route. Each time. Our interest are hiking,photography birding and cycling, yours might be different. We enjoyed Palo Duro Canyon Tx, Painted Desert, Canyon De Chile (sp) White Sands, Big Bend NP, San Antonio, Padre Island, Mustang Island Mohab and the parks near it, just to name a few of our stops when going to AZ. We really liked Tuscon and will be back in 2017 for a month.
We tend to move around a lot. We try to stay in a NP or State Park whenever we can.