Hello, we are a family from Australia looking at doing a road trip sometime between May and October this year. I have just been considering possible destinations and came up with this possible route. Just wondering if 4 weeks would be long enough and also what time of the year do you think would be best for this trip. I don't like sightseeing when it's hot but I'm also a bit scared of travelling in heavy snow since I'm unfamiliar with it. We did 2 road trips last year. LA-SF-Lake Tahoe-Las Vegas-GC-LA and another on the east coast.