Urban Bike Park with some Hiking
Desert Trails Park was put together by the City of Mesa with help from GroAZ, it opened in November 2014. This is mostly a bike park with flow trails, but hiking is allowed on some of the trails as well.
There is a hill in the center of the park and the trails feed off of this. There is a Perimeter trail, 3/4 of a mile long open to both bikes and hikers, there is also a trail that goes up to the peak of the hill and then back down the other side, probably close to 1/2 a mile, also open to both bikes and hikers. The hill is not huge but it does offer a nice 360* view, all of the Valley's mountains can be seen from here, it's pretty spectacular.
The rest of the trails are for bikes only. There are 3 downhill flow trails. The green (beginner) trail starts about a 1/4 way up the hill, has some berms and table tops, start here and test your skills. The Blue (intermediate) trail starts halfway up the hill, has some more advanced drops, berms, and some gap jumps. The Black Diamond (expert) trail starts at the peak of the hill, this should be attempted only by those that know what they are doing :)
All the flow trails connect up with the perimeter trail and it brings you back. There is also a Skills area and a pump track. The city did a nice job with this place. It has some picnic areas, nice restrooms, and even a water bottle fill station. The perimeter trail and the up and over trail are nice, but short, I could see trail runners doing a few laps here.
Check out the Triplogs.