North Park Red and Blue Trail
The bike/jog trail in North Park is a fairly broad paved burm of the road tracing a 5 mile path around North Park Lake. For half of the trail, bikers and joggers share the space but along the one-way Lake Shore Drive, bikers and pedestrians each get their own lane traveling clockwise and share another combined lane in the other direction.
There are places to park all along the route along with many water fountains, rest rooms, picnic shelters and playgrounds.
There are also more than a dozen Geocaches located within park boundries, four less than 1,000 feet off the path. One could spend a whole day logging them all, and racking up about 15 miles of hiking.