Baden as in the intro mentioned is due to its central location a passage city.
Most trains from Zurich to Bale/Berne (vice versa) stop here, so it is very easy to catch a train in either direction without checking much with the itinerary.
Baden is less than half an hour from Zurich by train. There seem to be a couple of departures an hour during the best part of the day. Since I did not want to validate my Swiss Pass until the next day, the return trip from Zurich was about 20 Swiss Francs. There are plenty of places to eat and a large shopping area in the immediate area of the train station.
At Baden railway station there ara Bus terminals on both sides of the station, check out on which side the bus will depart...