Fall Creek Falls State Park, located in Central, TN is a hidden gem - stunning! It is the largest TN state park, has six waterfalls, one of which is the highest east of the Mississippi, six spectacular look outs and the second largest cave chamber in the U.S. I've been here several times over the years.... would go back again!
Mississippi Headwaters - The Mississippi River gets its start in Minnesota, and its headwaters at Itasca State Park are a must-see destination. This route follows the Great River Road north from the Minneapolis-St. Paul area, tracing the Mississippi as it arcs across northern Minnesota. There are lots of interesting historic sites and scenic parks along the way. more info at: http://exploreminnesota.com/travel-ideas/itineraries/a-trip-north-to-the-mississippi-headwaters/index.aspx