Mike, Check out http://wiki.openstreetmap.org/wiki/US_National_Park_Service_Data and http://wiki.openstreetmap.org/wiki/US_Forest_Service_Data on the wiki. See also http://wiki.openstreetmap.org/wiki/Potential_Datasources#U.S. to see about sources in your state (and be sure to add any you find).
I imported the national parks and forest boundaries in my area from the local Forest service GIS database. Depending on the rules governing copyright of municipalities in your state there may be state, county or city data that is public domain. Also for national shapefiles see http://nationalatlas.gov/atlasftp.html#fedlanp (lowish resolution shapefile of all of the federal lands) and specificially for all national park boundaries http://science.nature.nps.gov/nrdata/datastore.cfm?ID=47653 (all of the national parks in the country, some appear to be very accurate) If you are to use either be sure to limit the import to your area of interest as many people have already done quite a bit of work on individual parks. -Tyler
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