We've stayed in NL 3 times in the last 4 years, and the camping and cycling infrastructure is really great. We visited the Dutch mountains last year for a few days on the way back from Austria and really enjoyed it. Noord Holland is well worth exploring also.
Thanks for sharing this, will take a look in future holiday planning sessions
Just to add to my experience of Holland, if you have kids its great where you would get frowned at if you have kids in some restaurants in the UK Holland is the exact opposite. Its a really family orientated culture. Kids positively welcomed in just about every place we ate or visited and the people are great.