That warmshowers site looks really interesting. Thanks for that link. I am thinking that I will mark out a route on google maps or something similar, print them all out, and use that. But also on the way down I'll get maps of the areas I am going through as I get to them so I can have some other reference material just in case I want to take a little detour.
Also the trail in South Carolina, the northern crescent trail looks like it would be a good route to take to get to Greenville from Jacksonville. Thanks!