Utrecht is one big playground for all ages. In this Utrecht Travel Guide for adults traveling with children, you can find many tips on how to make a city trip with kids even more fun.
There is a list of sights that are of specific interest to those under 15, both inside and outside of the city centre. An overview of sports possibilities and child friendly restaurants. There are chapters on playgrounds and petting zoos, shops and Miffy.
A special paper chase route will lead you through a part of town the exciting way: whilst you enjoy the historic city, your kids will be kept busy trying to find the unicorns and tea pots.