We are returning to CA in July. This will be our second visit. My husband will be working out of his company's Irvine office. We've got our Southern CA itinerary planned. I need some help with Northern CA. We want to see the Sequoias while we are there this time, and plan to spend a weekend exploring. First, what are your recommendations for areas not to be missed? Our son is 6, if this helps. Also, will the temps be much cooler than Southern CA? Will we need jeans or light jackets? Finally, are there any must-sees on the drive up from Irvine? Any help you can give will be greatly appreciated! Thank you.