Tahoe is huge. No shore or South shore? Or do you know? South shore has more casinos and traffic, but also has cheapo hotels on the CA side. No shore is more laid back with less traffic. My favorite hotel is the old Caesars on SO shore, bath tub in room for four runs 300+ a night and Hyatt N shore currently running 400+
There are hiking and biking trails, you can ride the Heavenly tram and pack a lunch. They serve drinks at the summit.
There is the back side of the Rubicon. Watch out for Jeep Jamboree traffic coming out.
Check the Web
I drove through there Sat night, it was 70 degrees and 95 in Placerville.
Have fun,
JB