There are some really great resources to help you navigate Tahoe by bicycle!
To locate the network of various bike lanes, bike routes, and mutlie-use paths around the Lake, Lake Tahoe Bicycle Coalition has put together a comprehensive, interactive map of bike trails which you can explore on their site here.
The Tahoe Area Mountain Bike Association, also known as TAMBA, is another great resource if you are looking for more information on the trail network. TAMBA builds, maintains, and advocates for multi-use trails in Tahoe and helps maintain more than 100 miles of trail per year. An extensive list of trails are catalogued on TAMBA’s site along with recommendations.