Jack, I'll get back to you about favorite shooting locations, but thought I'd let you know that Arches and Canyonlands are national parks, whereas Natural Bridges and Grand Staircase-Escalante are monuments. The distinction may be trivial, but if you're organizing an expedition, I thought you'd like to know. As far shooting locations, there is the classic, Mesa Arch. You may, however, get a better than classic shot in January. I think that the sun rises in a better location in January than summer for sunrise photos, and if you're lucky you'll have some snow.