Folkston is a must see. Economy's got the traffic down but still busy and a fantastic viewing area. There's usually a couple to half dozen railfans gathered so it's fun even without trains going by. If hunger strikes, do look at the Okefenokee Restaurant. It has a buffet at both lunch and dinner that will satisfy for little $.
In the Orlando area, I enjoyed visiting the Central Florida Railroad Museum, 101 S. Boyd St., Winter Garden. http://www.wghf.org/aboutrrm.htm