My friend and I are planning a road trip from San Diego to Lincoln, (a) to see her granddaughter who has recently moved there, and (b) to see as much of the USA as we can en route, and have a great time. Any and all suggestions would be welcome. We are at the very early planning stages, so are not sure what time of year would be best, which route would be the most scenic, which the easiest, etc. We hope to spend at least a couple of weeks on the trip. We are neither of us spring chickens, but very young at heart and fit and healthy. Many thanks for your ideas and tips.