I'm looking for some insight from any German Mustachians on the forum, or anyone who has experience travelling / camping in Germany.
I will be spending about two weeks in north-western Germany with my girlfriend later this summer, from late July through early August. The last four days of our trip we will be attending the Wacken Open Air metal festival in Wacken, about an hour north of Hamburg. The week or so before the festival is entirely open at this point, I have yet to decide where to go and what to do to fill the time. I'd love to explore the German countryside, do some nice hikes, and see a castle or two. We may drive over to Berlin for a couple days, or possibly head up the coast into Denmark. There are so many awesome and interesting places within a few hours drive from the airport in Hamburg where we'll be landing, I'm having trouble deciding what to prioritize. I don't want to just spend time in tourist heavy areas either, I'd love to go off the beaten path and explore some of the hidden gems that I'm sure are all over the place if one knows where to look.
Another big question I'm considering is how best to handle camping gear. We will likely be spending some of our nights in Airbnbs, but we will definitely be camping out during the festival at minimum, and possibly more. The festival itself has tent rentals, but I'm wondering if there is anywhere I could go to rent a wide arrangement of camping gear (tent, sleeping bags, camp stove, etc) while we're there. Doing so would save me the trouble of having to transport my own gear the whole way there from home, which would likely require a whole extra suitcase at minimum. Are there any chain retailers in Germany that do camping gear rentals like this?
Any insights are greatly appreciated :)