I'm a guy from Lithuania, Europe, who came to US for the summer and now me and 2 of my colleagues are planning to travel, for which we have 3weeks. We'r starting from Chicago and we would appreciate any kind of traveling tips to California North and getting back to New York - South. We'r gonna do it with a car, so we are choosing between Interstate 70, rout 50 (loneliest road) and rout 66. Which one of these would be the best for sightseeing and also wouldn't take a lifetime to get to California? I mean, we need a good and fast road to reach Cali and see a lot.
It's our first time in US so we'r don't really know a lot, so we would appreciate any kind of advises, where to go, where not, any unsafe areas or states, places for stops to rest etc etc. Thank you in advance!!