"Woodland Wonderland Tryvann is a nice little area within Nordmarka (another afar.com highlight), that has everything you can ask for in a forest. Tryvannshøgda, a large hill, overlooks the three small lakes: Skomakertjern, Lille Tryvann, and Store Tryvann. The television mast Tryvannstårnet on top of Tryvannshøgda is open to visitors, and on a clear day you can see all the way to Sweden from it. Tryvannstua, a small cabin that serves snacks and refreshments to hikers, is open year-round. If you're into skiing, Oslo Vinterpark has 18 slopes and is Norway 's 4th largest ski park."