I went for a ride after work yesterday up Days Canyon Trail (Hobble Creek UT). First time on this particular trail. It climbs up top pretty fast so its a good workout for the horses, and its about 15min from home to the trail. Once you get up on top it links into a network of trails that you could ride on for many, many miles.
The trail starts in the bottom of a canyon with lots of shade and you ride that way for a couple 3-4 miles before the sun can get to you so its a great afternoon ride. By the time you are hitting the top the sun is going down and you've climbed so much in elevation that it isn't hot anymore.