Looking for advice on a trip planned for April to Fort Myers. We have young children and have made the 20 hour road trip 3 times already. Kids are a bit older and want to incorporate more learning experiences on the way down. Another change for this trip is that we want to take our time on the way back home and stop in Savannah, Georgia, Hilton Head, South Carolina and Knoxville, Tennessee. We are looking for tips on what not to miss, best route and if these three sites are something to accomplish within a week time frame. Our interests include trains, mountains, beaches, good eats, nature, festivals and any special site specific interests for these areas.