Attached to the Arktinen Rekikoirakeskus, this excellent set-up has a vast program of activities. In summer these include canoe and boat trips (€50, three hours), midnight-sun rafting trips (€45, 1½ hours), foraging tours (€50, four hours), and fishing (€80, five hours) on the salmon-packed Muonionjoki. In winter, try reindeer sledding (€140, five hours) and snowmobiling (€110, two hours).
You can also hire bikes, boats and rods here. There's on-site accommodation and a restaurant.