Lake Garda is east of Lake Como, so it's easier to get to from Venice and Verona. It's just a 1.5-hour train ride (or 2-hour drive) from Venice, although Lake Garda is really close from Verona: just a half an hour in the car, or 15 minutes on the train. (The train station you want at Lake Garda is Peschiera del Garda).