What are some fun things to do in South Lake Tahoe?

Me and boyfriend are going to South Lake Tahoe in a couple of weeks. Please keep in mind there will snow and neither of us ski or sled (anything to do with the snow like that). We are 23 years old. We have been there several times before but never do anything besides the buffets and casinos. Is there anything else we can do that's indoors? Maybe a show or comedy club? Thanks