The Rails to Trails folks are currently giving away a trail guide for making a $35 dollar donation to them. Pick your favorite trail guide from the list on the site at this link. Instead of a paperback book, you could instead select an E-Book guide for your Kindle or tablet.
These guides cover Rail Trails in the Southeast; New England; Mid-Atlantic; Midwest; West; and PA,NY & NJ areas. Pick your favorite area and support this fine organization.
While most rail trails are located in urban areas, some regional rail trails like the General Van Fleet and Withlacoochee State Trails in Florida are located far from towns and follow through woods, forests and farmland along the way. I like travelling them just to enjoy the outdoors and have created multiple day trips along a few of the longer trails. Rails to Trails TrailLink mapping system works very well for locating these rail trails in your area and for planning your day. There are about 25,000 rail trail supporters in the state of Florida, and many have supported the state in creating more rail trails and with expanding connections between existing rail trails. A lot of energy has been expended to make your rail trail trip more enjoyable. Please check these trails out as welcome alternatives to just backpacking only in the wilds.