Don't be embarrassed. I was in your shoes a few years ago. I don't gamble much, don't ski (snow or water), and when someone gave me a 2 night stay up there, I really had no clue as to what to do.
I've since been up there quite a few times.
I'm no expert, but the restaurants I've enjoyed are The Beacon and The Riva Grill. The Beacon is on the beach at Camp Richardson. It is super casual, has a large deck, live music and good food. Rum Runners are their specialty drink. The inside part of the restaurant is fairly small, so if it's not cold out, sit out on the deck and take in the view and listen to some music.
The Riva Grill is close to the casinos and is more upscale than the Beacon. Wet Woody's are their specialty drink. They have an enclosed patio with heaters. The restaurant is large and the upstairs section has great views.
If you're into buffets (my wife almost never goes, so that means I almost never go), the Forest at Harrah's is pretty decent, but the views are spectacular. It sits on the 18th floor.
We've also done the Fresh Ketch at Tahoe Keys. Has an older feel to it, but was decent.
That Chart House is up Kingsbury Grade, and though far from the water, it has great views. Upscale.
I have yet to take a boat cruise, but shall some day. We did rent a paddle boat near Zephyr cove and cruised around a bit. That was fun.
Other than that, I got nothin'.