I really enjoy this park. It's close to my house but easy to get to from 215 on the west side from either Durango or the Sunset exit. It's got a great childrens play area, many picnic tables with shade and a couple of Baseball/Softball fields. The public restooms are usually open and clean as well.
I like to do my Cardio here because it has an sidewalk that wraps around the outside and measures almost exactly a mile. It's plenty wide enough when you pass people going the other way, no need to step off onto the grass to get around.
This park also boasts a "Disk Golf" course. It's only half a course (9 holes) and I haven't tried it yet but it looks like a lot of fun. They seem to use a special kind of Frisbee though and I'm not sure where to pick them up. But would be a great way to get some exercise, enjoy the outdoors and people/dog watch.