If you want to add a bit of extra culture to your trip, put Museum Bisdom van Vliet on your must-visit list. Check for guided tours or just roam around at your own pace.
This museum is on the to-do lists of many visitors to Haastrecht. But Museum Bisdom van Vliet isn't the only drawcard here. Catharina Gasthuis, Stadhuis, and Brouwerij de Molen are some other worthwhile sights close by.