My fiance and i are driving around california for 2 weeks. We are staying 2 nights in napa valley then driving 5hrs from Napa through Yosemite National Park including stopping in the park to see things, before staying 1 night at Mammoth Lakes (we could not find reasonably affordable accommodation in the National Park). We need to be in Las Vegas 2 days later and dont know whether to stay another night in Mammoth Lakes and drive back into Yosemite for a full day exploring/hiking the park then do a full day drive through Death Valley NP to Las Vegas the next day or do Death Valley in 2 days staying at Furnace Creek for 1 night. Is one day of solid driving enough to see Death Valley sights??? Or do we do another itinery to get to vegas like sierra NP or Kings Canyon NP? It will be early August and im also worried Death Valley will be too hot for us to handle especially if staying there one night... hence the option to take 10 or 11 hours to drive the 6 hours btween Mammoth Lakes and Legas stopping many times along the way is currently our plan ..Any advice would be great.