Renee and I rode Centennial Cone Park near Golden Colorado today. It was fun except for our friend Dan almost chopped off his finger with his bike disc brakes. This happened in the parking lot before the ride...
Otherwise, it's a great trial if you like smooth and long extended gradual climbs and descents. Nothing technical to note.
Lots of good views too.
I'd say check it out and make sure you either do it weekday or on an even weekend day. it's on an alternating hiker/biker schedule.
Centennial Cone