The great American road trip is a tried-and-true family tradition.Driving the country's scenic highways and stopping to explore anything that catches your eye — perhaps a stunning viewpoint, a side-of-the-road lobster shack or a historical marker — is a wonderful way to explore the United States with your family this summer.It's also a great way to save money while exploring, whether you redeem points, rent an RV or find affordable hotels, motel…