I am taking my first big road trip alone in late August. I have 3 weeks and wanted to try to make it from Philadelphia to California and back.

My feeling is that this trip can be split up into 3 parts 1)going from philly to california 2)going from san francisco to LA to san diego 3)going from california back to philly

My plan is to take major interstates on the way to CA and spend about a week going through the state. This would leave me with about a week or a week and a half to go from california back to philly, hopefully taking two lane highways and seeing some sights.

My question is, does this sound reasonable? Does anyone have any alternative suggestions?

Thanks a lot of any help -Justin