I grew up in Sacramento and am familiar with all the areas you are talking about.
National Park Service
Take rain gear if you are going to do the mist trail, they don't call it the mist trail for nothing. Take two pairs of good, broken in walking shoes. Drink more water than you think you need to, much more. Take water and a whistle on the trail with you. You dehydrate quickly at higher altitudes, and you are perhaps used to higher humidity?
They are almost certainly repairing some of the roads in that area, some also may still be closed due to snow as it was a heavy precipitation year. Don't fly into Tahoe, fly into Reno, cheaper than Sacto. You can take 395 South and catch the park from the backside, one of the highest elevation roads in the country, 140 or something. Fill your rental car with fuel outside the park if at all possible.
Awesome roads in the area, you can also take Hwy 431 to Lake Tahoe and get about the best view of that lake you can drive to, there is a scenic overlook that has a little turnout with info about the lake. Tahoe is something to see, as is Yosemite.
Oops, just checked, Tioga Road is closed, no estimated opening date, you need to make reservations way ahead, check the road situation out as your departure approaches.
BTW, The Awahnee is The Cat's A
ss, but you will pay for it, probably a link to it at that Parks Site, get in better shape before you go, it will totally be worth it