You're a step away from water when you're here, so hopping on a motorboat or sailboat to explore the lakes is a popular thing to do in Tahoe. You can go on charters or rent your own vessels. Some rental companies will ask you to sign a form saying that you won't go into the water, due to the cold temperature. Check with your outfitter if this is an issue for you.
Lake Tahoe COVID-19 Information