Because of Pentecost weekend (pinksteren in dutch), the monday is a free day for most people. I go to the Ardennes with 3 friends. Its not exactly sure where we will go, but I think we go to Houffalize, a Belgium city in the province of Luxembourg. From my town in The Netherlands, its a 3 hour trip by car.
It will be an active holiday: Mountain biking, maybe Canoe, walking etc. We will sleep in tents on a scouting campsite. Oh and before I forget it... the idea is to visit the La Chouffe beer brewery.
Have a great weekend, I'll be back on monday!