The Walk Books have explicit instructions on where parking is available. Unfortunately the parking availability changes faster than one might hope so have some alternate plans - a good idea anyway because the parking lot may be full when you get there. The Trail Conference sells hiking maps of many local areas. Trails Illustrated sells maps of many National Parks at a discount to Trail Conference members. Look at the list of member clubs .
Several clubs specialize in singles hikes.
Let me count the ways. No matter what your interests or occupation we can find you a volunteer position. Fill out our volunteer data sheet when you become a member and someone will call you. There are almost always openings for trail maintainers, not necessarily in any particular park, but you can start anywhere and move to a more preferred trail as it becomes available. See also the web pages on Open Volunteer Positions .