The North Sea Cycle Route will take you most of the way. It is fairly well signposted and you can get the maps in booklet form for Germany and a set for Netherlands. Campsites are all marked.
There are some good ferry routes to the islands. Harlingen to Vlieland, then over to Texel and ferry to Del Helder is a good detour. Vleiland is a car-free island with a nice campsite signposted just inland from the coastal road, a few km S of Vlieland town.
Texel has a pretty main town and a farmyard campsite close to the main ferry terminal but you have to ask around, it is not well signposted. The other campsites are huge commercial tourist ones.
Last edited by MichaelW; 11-06-10 at 05:17 AM.