Thanks for reporting back mid-trip.
On your way to or from Lake Tahoe you might consider a stop at Apple Hill for some great apple cider donuts. Don't know how many farms are open yet.
Abels is one of my favorites that is a quick on/off the highway. My absolute favorite for both cider and donuts is Rainbow Orchards, but they are a little out of the way. Don't know if they are open yet either, but they've been selling blueberries at the local farmers markets lately.
If you make a rest stop at Apple Hill, stick to the donuts and cider. The pies are ok but not amazing.