It is recommended to buy the tickets online for a hassle-free experience as the queues can be quite long.
It is recommended to visit during the weekday, as the park tends to get crowded on weekends.
If you have more time in Brussels, consider visiting the Royal Palace of Brussels or taking a walking tour of the city's street art. If you have less time, skip the Belgian Comic Strip Center or Place du Petit Sablon. Be sure to wear comfortable shoes, as many of the city's landmarks are within walking distance. It's also a good idea to buy a metro ticket, as it's the easiest way to get around the city quickly and efficiently.