After our stop, we headed for North Port and a ferry ride to Washington Island. You can take your car on the ferry or take the Cherry ride to see the entire island. They also rent bikes if you prefer more exercise. The ferry ride is 30 minutes and is very comfortable. There are a couple of restaurants on the island with great hamburgers and cherry pie. You can't leave Door County without having some cherry pie. Door County is known for its tart cherries. On the way to the ferry, we stopped at Seaquists. They treat you to a lot of samples and a wide choice of cherries.
We met some people on our trolley tour who were there for the classical Peninsula Music Festival. Door County is the home of many festivals. Door County Navigator has a complete list of events. http://www.doorcountynavigator.com/main-sections/calendar
There is something for everyone in Door County. I recommend that you book your hotel well in advance in order to get a reservation as well as make reservations for all your sights including the trolley ride, dinner, and theater. However, if your kids are set on water park activities, skip Door County and head for the Wisconsin Dells.