Me and 2 of my mates are planning a 3 week road trip in America next year. I've been to New York and Vegas and want to go back there but also to other parts of America.
Originally we were doing just the east coast (Boston to Miami) but could end up doing East to West Coast instead (Boston or New York to LA or San Francisco).
Want to see in particular New York, 1 day in Philadelphia, Washington, Vegas, San Francisco, Southern Cal (if it's realistic with the time).
We know the east coast and west coast places we want to visit in the main but aren't sure whether to take the northern, central or southern route from east coast to Vegas. What do you guys recommend? And is 3 weeks enough for this?