We are so lucky to have Forest Park so close to the city. The trail head on Thurman can get really congested with cars, peoples and dogs, but once you get going, it's pretty peaceful. The farther you go, the fewer people you run into. You can walk (or ride) for miles and miles. It's a good thing there are mile markers, because it's easy to lose track of time and distance.
Pros: close to city
Cons: crowded, street parking