you could do worse than Moab Utah, with bike access to various state and National parks including garden of the gremlins, the back side of Mesa Verde, Capital Reef, Canyonlands Arches ,and several others. True it is not going to be exactly cool, but at least the humidity is lower, it is cooler at nights (altitude warning)r and the scenery is spectacular. You can also access the north rim of the Grand Cnayon, Zion and several other sites from Moab as well.