Hi, a friend and myself are setting of to San Francisco on Monday from England for 4 weeks. We plan to end up in San Diego as we fly out from there home. We plan to spend about 4 days in SF and then we've hired a car for a large majority of the rest of the holiday. We want to travel down the coast, see the Big Sur etc and stop off in LA and travel across to Las Vegas. Can anyone help with suggestions as to what we should do and see? Time frames etc? Is it possible to see the National Parks too or are they too much of a detour?! Many thanks!