We will be in Venice on a Saturday in October. We will have only 1 day and would like to take a walking/boat tour. Please recommend the best English speaking walking/boat tour for seeing the most of Venice in a short time (3 to 4 hours or less tour.) Also, have read it is best to park on the mainland - either at Tronchetto parking and catch a boat into the city or near the railroad station in Mestre and train into the city. Where is the best place to park? Thank you.