One more vote for Sedona. My wife and I went there last April and the weather and trails were about as perfect as you can ask for.
You can also make a stop on your way there or back in western Colorado. Some of my favorite rides are right off of I-70. We just did the Ribbon Trail and Horsethief right before Christmas. Tons of BLM land right at the trailhead for 18 Road that would be perfect for a camper.