I made my way over to Deer Creek Canyon for a long trail run last weekend. This park is awesome. The HR trails are great, but when you need some more technical trails with more elevation gain, you can't beat how close Deer Creek is to the metro area.
This park is very popular with mountain bikers, but if you get a few miles back, you find solitude on some delicious singletrack (Homesteader and Red Mesa trails) through the forest with the occasional vista of the eastern plains.
Once I got up to the Red Mesa Loop, I just lapped this 2.5 mile trail three times before backtracking to the parking lot. Total run for the day was 20.5 miles.