Kalvträsk is defined by wilderness. An important reason for this is the Vitbergen Nature Reserve. There are 30 kilometres worth of hiking trails here, amongst other things. They have proper footbridges that will take you straight out onto the mires. If you would rather paddle along the winding creeks, that is of course just as good an option.
There is also real wilderness accommodation in Kalvträsk. Four-bed log cabins with kitchens and bathrooms and a large service building.