caravan sites in Holland and germany

Hi, I am very new to this and don't do facebook or twitter either so will probably end up rambling! We are looking at taking our caravan to holland and germany next year, travelling Hull to Rotterdam. We are thinking of a week in germany and a week in Holland. We have looked at many sites on the internet and overseas brochure, but they don't indicate what the surrounding area is like and what there is to do locally. Ideally we would like a site very near to a town/village where we can walk for a drink/food etc  and not have to drive. We are also going to take bikes. We will have one 15yr old daughter with us. We don't want to go too far into germany as we don't want too long a drive, and were considering somewhere around the Cologne region. Have any members any suggestion of sites for us or good internet sites to research?

Thanks

Anne