It can range from 60 and sunny on the high end, but it could also snow! You’ll always want to have a jacket with you or a shawl for the wedding night.
Yes definitely, but you wouldn’t want to take a cab to a trailhead as you might have a hard time getting a ride home. You would be ok to cab/Uber/lyft between Reno airport and Tahoe City, or from Tahoe City to Truckee for example.
Here’s the most notable places, drivable from Lake Tahoe: 1) You should really drive all the way around the lake as it is absolutely beautiful. 2) Visit San Francisco where David and Milly live! It is a 3-4 hour drive. 3) Yosemite is stunning, and should be gorgeous in the fall. The weather is similar to Lake Tahoe (hopefully 50-60 degrees during the day, then down into the 40s at night), and it is a 3 hour drive. 4) Napa Valley is just under a 3 hour drive. Wine tasting anyone?