Arches National Park
Arches deserves a full day of hiking, in my opinion. Start early morning at the primitive loop, where you will find lots of arches, plus the Dark Angel rock formation. This loop can easily be done in half a day, giving you the afternoon to visit the other rock formations. I highly recommend visiting Delicate Rock before its invaded by tourists, maybe just before going to the Primitive Loop. Please find all ways that you can walk around the arch, it will give you beautiful perspectives. Balance Rock is perfect when the sun is coming down, see below.
These are shots from the Primitive Loop area:
Dark Angel ............
These were taken from the Balanced Rock area. The beautiful La Sal mountains in the background.