Our family (2 adults, 2 boys at age of 10 and 4 respectively) is planning visit San Franciso from Toronto,Canada by air before end of April. It's our first time to SF, we prefer rent a car and go sightseeing, interest places are San Francisco ,Yosemite, Big Fur, Kings Canyon. Will have 9-10 days. Have done a little bit research, Yosemite will be partly closed in Spring. Wondering if we would have enough time to go to Big Sur and Kings Canyon. Also, which is the best route? some people said April would be a little bit traffic Jam on the road, is it true? We don't want to be rush, so how many days shall we spend on each place? If we don't have time go to Kings Canyon or Big Sur, it's OK. Anyone can help? Really appreciated your time.