I discovered a new entrance to Bartlett Park the other day. I've been approaching it from the Albertson's parking lot and just learned that there is an opening from Adams. I knew there had to be other openings, of course, but for some reason I never looked for them.
Anyway, the Adams entrance takes you to the bottom of the valley and leads to a nice, smooth path. There are dog walkers here, too, but most of them seem to actually pick up after their dogs, so it's a more pleasant experience.
Anyway, there are also entrances on Coldwater Lane. Some of the kids were using it as a way in for their dirt bikes and the shovels that seem necessary for making bike paths.