Pine Hill Preserve
Details
The trail starts behind Rassmussen Park, we'll gather by the tiny bridge at the far end of the parking lot.
There are two distance options here. We'll start with a 2-3 mile loop on fairly flat terrain, featuring a pond. Then if you choose continue there will be another 4-5 miles of significant hills with nice vistas at the top.
More info: https://www.eldoradohiking.com/rassmussen-park-trails-6.html