A free, guided walking tour of Tahoe City’s waterfront along the Lakeside Bike Trail is at 10 a.m. Topics include the Truckee River, dam, water rights, flow rates, rafting, water clarity, historic sailing vessels, motor boat racing, fish, Commons Beach, as well as current things to do and places to eat in Tahoe City. Family friendly. Mostly flat, easy. Leashed dogs OK. Meet at Gatekeeper’s Museum. $5 donation includes museum admission. (530) 583-1762.