Bron: What price class are you thinking of? There are hotels ranging from 40 to over a 100 euros per night (for a double).
Of course you can take a train from Brussels. This will take about 5 hours and 20 minutes, assuming you take the Thalys to Rotterdam. In Rotterdam, you'll have to change trains. Check out this site .

Wilfried: yes, counting on you!

All: I have confirmed the booking for Saturday night. I will start booking the youth hostel for those who would like to stay there, but I need a list of people first! Or we could opt for the scouting hut, but I suspect the hostel is comfier and more convenient (city centre).
I'm making a website, but it's not finished yet. You will find it at this site .

Love, Letty