Dh and I are heading to SF next week. We have 7 nights. Our current plan is to spend the night of our arrival in SF, then 4 nights in Napa, and the last 2 nights back in SF. Now I'm worried that 4 nights in Napa is too long and 2 days in SF is not enough.(our flight home is very early am). What would you all do? This is our first trip to the area. We enjoy wine but for four days? Are there other things in Napa to do/see? We considered a night or two in Yosemite, but I want to have a relaxed vacation and not spend it in the car rushing around from place to place, plus we will definitely return in a few years with our kids and I would like to see it with them. Thoughts?