Originally Posted by cyclistjohn
We ride the towpaths in the UK, but some are very bumpy, so it will be nice to see how good the Belgian paths are :-)
I have less experience than the OP, but...
Most of the towpaths will be very high quality, everything in Flanders I rode was top-notch. Some of the paths in Wallonia got a little rougher -- short stretches of gravel and/or dirt along the Meuse, for example. Nothing a good touring bike can't handle.
FWIW the cycling maps you can get in Belgium / Flanders are awesome.
I'd use the OP's stuff to plan your routes and the local maps when you're on the bike.