People please realize that this is a OFF-LEASH DOG PARK!!! It has a canal with reasonably clean water that pretty much all the dogs play in. That being said, if you are NOT willing to get a little wet from shaking dogs then don't bother. Personally, my dog loves it here but I never enjoy hearing someone complain about getting wet or annoyed by dogs...AT A DOG PARK. If your dog is well behaved, then by all means come and check this place out!
Hike at your own risk. This open space lies due east and well within the fallout zone of the former Rocky Flats factory. That facility manufactured parts for nuclear bombs out of plutonium and both airborne and waterborne waste has been documented in this area. The Woman Creek reservoir, which is visible past Mower Reservoir on the west side of the open space is a catchment pond for keeping polluted waste from continuing to Stanley Lake.
Nice for being close to town, not too busy, and a great place to go with dogs. It's also fun for geocaching as there are half a dozen geocaches here. But as far as open space goes this is about as exposed and boring as the Front Range gets. There are panoramic views of both the front range and the Denver metro area. The trails are rocky so hiking footwear will help you enjoy it more.
WARNING: This entire space is an OFF LEASH dog park. As soon as I stepped on to the trail I had a dog jump on me with muddy paws! This is unacceptable; dog owners should be more in control of their pets or keep them on a leash. Just because the park is "off leash" does not mean that there are no rules. There were at least 2 other occasions that dogs got uncomfortably close to me and the owners didn't seem to have any control of their pets or they just didn't care. Otherwise, the space is pretty nice with lots of branches off of the main trail. I hiked about 4 miles here and was able to find trails further away from the parking lot where dogs did not bother me. This really should not be reported as a "hiking" trail because it is really just a big open dog park.