Got to see the casinos.

South Shore:

The Lakeside Inn
Horizon
Harvey's
Harrah's
Bill's
Caesar's

North Shore:

Cal Neva
Hyatt Lake Tahoe
Tahoe Biltmore

You should also check into the Lake cruises. I think they have a dinner cruise. Where are you staying?
I'm going next month... love that place. I always seem to overlook Tahoe for Reno or Vegas. Beautiful country up there. Have fun