Two thoughts:
First, the East Coast is tougher to follow. Boston, Philly and NYC are major obstacles. There are also some low lying regions in Maine and the Carolinas that interfere with travel close to the coast. In Florida, you may find horrific traffic along the east coast since the road runs right next to the beach. Planning will be important!
Second, don’t ignore the Great Lakes. Less hectic than the ocean coasts, for the most part. Still have some big cities to dodge. Just a few items are the lighthouses on Superior and Michigan, gorgeous beach at Holland, Michigan, Mackinac Island and the bridge, Indiana Dunes, Kohler-Andre State Park in Wisconsin, and Door County further north