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Yes. I've ridden a lot in the hilly area to the east of Cologne - Bergisches Land and Sauerland - as my mother in law used to live there. It's lovely riding, quiet roads, decent climbs (not mountains), smooth surfaces, light motor traffic, etc.
I've also ridden in most of the other areas but not so much. They're petty flat. Quite a lot of cycle paths, which are often good, sometimes mediocre. Still pleasant riding though.
I would definitely have considered it if the dates had worked.
Anyone that familiar with this area? Nice enough? https://dutchbikepackingraces.com/. I don't know that area at all but the dates would work quite well for me.