Kobuk Valley National Park is well known for its two sand dunes areas and for its historic caribou crossing on the Kobuk River at Onion Portage. Rafting and boating are popular on the Kobuk River. There is abundant wildlife but no marked trails. Access to the park is accomplished by air taxis from Kotzebue and Bettles. Tundra tire planes land on the sand dunes and float planes can land on the Kobuk River. There are 2 Ranger Stations within the park and the park but no marked hiking trails.