Dear lazyweb: Which way to California, please?

With only a few weeks left before my epic cross-country trip, I am looking to you for suggestions which roads to take and what sights to see on my way to the Bay Area.

My father is flying in to tag-team driving with me. He's never been to the US, and I'd like to make the trip worthwhile for him.

I got about 7 days at my disposal to complete the trip.