You may swim in Lake Oulujärvi all around Ärjänsaari Island. You can swim and sunbathe, enjoy the sea-like atmosphere on the beach, or you can play beach volley or throw a flying disc. Take your own ball or flying disc with you. Swimming in the waters of Ärjänsaari Island is at your own risk.

Located in Lake Oulujärvi, Ärjänsaari Island is surrounded by fishing waters. You may angle and go ice fishing under the everyman’s rights. You will need permits for all other types of fishing. More detailed information is available on the kalallakainuussa.fi. site.

There are geocaches (geocache.fi) on Ärjänsaari Island. Geocaching is a fun way to explore the island.

You are allowed to pick berries and mushrooms on Ärjänsaari Island.

You are allowed to go cross-country skiing and snowshoeing on Ärjänsaari Island. The Koutaniemi-Vuoreslahti village society (koutavuores.net) organises the Ärjän kierrän skiing event annually in March.