I just got back from a hike at Walnut Creek Park and I have to say that it's a fun place. Lots of trails that cross each other often giving a hiker the ability to choose whatever length trail they desire. For example, I hiked for an hour and a half, when I was done I just headed back at the next fork and was back in my car ten minutes later. I never walked over the same section of trail twice and there are still a bunch of trails left to explore. Sure the trails are geared towards the mountain bikers somewhat but they are still perfectly hike-able. The park has a great variety of plants from dense walls of brush to stands of bamboo to open meadows and thickets of cedar. What the park lacks in up an down difficulty it more than makes up for in accessibility and length of trails. I went on a Monday afternoon and I saw no bikers and only two other hikers.