We used the Park n Ride feature of the Stadion. If you use this option, there is a specific lane you must use to enter the underground parking area. That being said, you use the parking machines to choose your journey and the amount of passengers. For 3 people to Centraal, it was 5.90 euro round trip. The caveat is, you have one hour to get from the parking area to Centraal. Then, when you leave Centraal, you have one hour to get back to parking. From what we gathered, and probably didn’t understand very well, was that you must go straight from Centraal to parking, with no stops along the way in or on the way out. I am still confused about it. Parking for the entire day was 17.50 euro, and again, it’s probably cheaper if you don’t mess it up like we did. The Stadion is a great place with a rich history. It seems very well maintained and from my understanding still used on a regular basis with sporting events, concerts, etc!