Blaarmeersen is good for Ghent, buses from outside to town.
The Municipal site at Tournai is excellent, and all for about 9 Euros inc electric and showers! Went there last year as it was in the right place for a stop, but the town is lovely, very old and interesting. Motorway Tournai Est exit, head for town centre, left at 1st Xroads the signed "Camping Orient"
Pete