We are a family of 4, kids are 10 and 12.
We usually bike a lot and the climate and terrain were very easy for the kids to handle. It was a beautiful country to bike around, with lovely paths, rolling hills and wild blackberries abound along the trails. All of the cities were charming. The accomodations were nice, we stayed in a hostel in Svenborg that was very lively and a fun change for our kids to be around Danish kids. Bike helmets ended up included so that was a nice surprise. The bikes worked great. Navigation was easy to follow and the recommended App was helpful to not have to pull the map out constantly. I would have biked for another week.