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Yeah, hide as best as possible.. But it's pretty tough! We rode from the Hook to Copenhagen (via Amsterdam, across the Ijsselmeer, through Groningen etc), and really struggled to find discreet spots... The landscape was so flat and manicured, and we rarely came across woodlands or even shrubbery to hide in.
We camped in one of the legal spots one night nr a town called Twijzel (or rather, on the other side of an overgrown field to it as we didn't find the actual spot until the morning...). But luckily, the Dutch seem to love their camping holidays, so you will never be far from an official campsite if you can't find a wild spot. Sounds like a nice spring trip - enjoy it!
speculoos-
This you may find useful/interesting. It's a list of "green" campsites in the Netherlands. Places where you can build a fire, if swimming nearby is possible, etc. It costs 15 euro per year to join, then you receive a book with a list of campsites and also the subscription allows you to use the campsites. Worth it imho:
the_orgazoid
Actually got off my ass and checked... Technically illegal (nothing new there) but there are certain legal spots where you can camp for free...
More info here: https://sites.google.com/site/paalkampeerders/English