Hi we are visiting Canada in August for our son's wedding, we have all ready done quite a lot in B C so have decided to head south. We have about 2 weeks to spend maybe a day or 2 more. We are thinking of getting a ferry to Seattle and driving, one way interior and then back the coast. My son says we should go to Yosemite, but is this a good time to go ,late summer with school holidays. Also how long should we allow to do the trip, will spend 2 or 3 days in San Francisco and a couple days in Yosemite if we go there. We like to do a bit of walking and see all things that nature has to offer. Also we would love suggestions of things to see on the way. Thankyou in advance.