Netherlands and Beyond

I have a ferry booked from Harwich, the afternoon of 1st May to Hook of Holland, back in UK Thurs 19th. No firm plans on where to go, probably tour around the Netherlands, mainly camping possibly odd hotel, average 50 miles per day. Looking to enjoy sights and food and drink. Happy to have some company for part/all of the tour. Open to changing start-finish dates to shorten tour slightly to fit in, if someone wants to do shorter, but cannot start earlier or finish later.