Hi, My partner and I are planning a 3 week trip in January and would be grateful for any advice you can supply. We are planning to fly from the Uk to San Fran and visit yosemite ect on the way to Vegas where we plan to marry and then visit Grand Canyon and travel up to Yellowstone. Which is the best route to take? We would also like to know what anyone would recommend on how to get from Yellowstone back to San Fran. Would all this be possible in 3 weeks? Kind Regards Linda and Anthony