1600 meter. "Finnish track" all the way around the Watersportbaan. Running there, making one round, and running back, roughly amounts to a nice 6 km tour. You can easily add more by taking a detour through the Blaarmeersen.

3300 meter. Largest skatepark in Belgium and third-largest skatepark in Europe, made for skaters by skaters. Also includes a parkour area.