Zwolferhorn offers a great outdoor activity. We took the cable car up (paid around 17-19 euros per person, but if you have an accomodation nearby you can get a discount) and choose to walk down. There are several paths, we took the route 855 and took as ~2hours. You would need good shoes! Weather can be tricky but there are several hütte on the mountain offering tea, schnaps, some simple food.