Welcome to the Walnut Creek Trail! Or, or as moondoggie called it, the Walnut Creek Greenway (WCG). I took a shot (and failed) "WCG is Tubular", and but decided to hide one on my way out. The WCG is wide open for all types of hides, so I'll do this easy style. very few people are in the trail, so you should have plenty of time to find this one.
Please replace as found, including how it's situated, so that it does not go kurplunk.