Another, less serious hobby of many NijSAC'ers is simply hiking. This can mean everything to a nice walk on a sunday afternoon, to a multi-day hike across a technical mountainous terrain. Whatever you want to do, there are always some NijSAC'ers willing to join you.
When you are going to do something more serious then a sunday afternoon walk, it might be a good idea to prepare your hike. There are no courses regarding hiking, but more info on this can be found on the NKBV page on hiking.