Opstapp

Choose a treasure hunt or walking route in this app. and go outside in North Holland. From the starting point, you use your smartphone to search for locations where you can carry out an assignment or receive information. Earn bonus points or vouchers. Young and old, alone or in a group, everyone can use this app Opstapp!  The Helderse Vallei is a sustainability center with a city farm near Den Helder. This app. Made possible thanks to the support of the Hoogheemraadschap Hollands Noorderkwartier.