Picking berries in late summer and mushrooms in the fall are popular activities. Fishing is allowed, although there isn't all that much to catch. In winter, the trails are open to cross-country skiing, although they are not lit or maintained.
Rock climbing is allowed only at Pitkäjärvi and the eastern Kolmoislammet. Ice climbing is permitted throughout the park.
Several tour operators specializes in Nuuksio:
Green Window
Arranges guided hikes, group tours, corporate retreats etc in Nuuksio. Has access to several cottages and even a Lappish hut for group accommodation, with saunas for charter as well.
Feel The Nature Treks
Feel The Nature Treks arranges guided canoeing, hiking and mountain biking tours in Nuuksio National Park. Wintertime company organizes also snow shoe and ski tour programs.