Acting as a Road Trip Specialist, map out a one-month cross-country road trip from the East Coast to the West Coast of the United States. Recommend must-see national parks, historic landmarks, and scenic routes along the way. Provide tips on renting the right vehicle, finding affordable accommodations, and planning rest stops. Ensure the itinerary accommodates flexibility for detours and personal preferences. 
<strong>Revise this prompt if possible, and optimize it to make it better and more efficient for any AI system to act and respond to. 
If possible run your optimized version.</strong>