Each of the vehicles has a loading zone in the Magic Kingdom town square. The loading zones are marked by signs. For example, the horse drawn carriage loading zone is right in front of the train station. The double decker bus's loading zone is in front of City Hall. Just wait under the sign and you'll be able to board the next vehicle (as long as the vehicle is out (you can scan the street to see what vehicles are out)). The rides are one-way to Cinderella's castle. I always ride the horse drawn carriage - it's tradition!!! However, last time the kids convinced me to ride the double decker bus which was lots of fun too!!