I am hitting a milestone birthday this April and would love to do a cross country road trip. I would love to hear ideas and the reality if I would be able to see at least 4 national parks (especially Mt. Rushmore, Yellowstone and Grand Canyon) starting April 7-21. My son would also like to see the Golden Bridge (San Francisco, CA). Currently I have a minivan, but I would rather rent a car so I could travel back to NY via air. Any thoughts or advice???