My girlfriend and I are going to lease a car in the states this May and going to drive from LA to NY, taking about 3 months give or take a few weeks. Any tips or critique that you esteemed gentlemen and ladies would like to offer?

Here is a rough outline of my route.

I plan on visiting San Fran either before picking up the car, or driving there after. I also plan on dropping off the car in NY, then travelling around a little bit like Niagara and Boston etc.