Belgium and Holland: summary and route
I probably don't need to tell you that Belgium and Holland are great for cycling :). However, here are some things we found useful:
For route planning: http://fietsroute.org
For bivakzones / pole-camping: http://bivakzone.be
Both are in Dutch, but Chrome will translate for you.
You may also find this article interesting, for other accommodation options in
Holland:
http://travellingtwo.com/resources/netherlands
I also wrote a wordy blog about the above: https://unprofessionaladventurers.wordpress.com/2018/10/22/fietsparadijs/
Not sure there's much else to say.....so here's a map of our not-very-direct route!!