Having made many dozens of trips over the decades from Daytona to Reno NV, our hands down favorite "see America" route was I75 up to Tifton GA then 82 all the way to Wichita Falls TX then 287 to Amarillo, then I40 to Kingman AZ. I40 lets you jump off on many old Rt66 alignments, our fav being getting on the section from Seligman to Kingman. 82 goes through many little towns but if you are not in a hurry is a wonderful trip with plenty of RV parks that never need reservations and many interesting people to meet. Regional cuisine is served all along the road. I could give you so many things to see but part of the fun is discovering them yourself.