It is huge park situated outside Brussels, but easily reachable with a tram! It has a great beautiful forest, which enables people to use their bike or go for a run! Also, there is something specific in the park... You can find meteors if you walk in the forest and I must say it's quite impressive!
It's worth walking around the alleys in the park. It used to be the King's "holiday house", so imagine the size of the gardens...