Due to its small size and the limited tourist development, activities in Koufonisia are restricted mainly to swimming and walking. Swimming is actually the only thing to do. The beaches in Koufonisia are not organized and provide great chances for total privacy (especially in Kato Koufonisi). Many of them are naturist beaches. Free camping is also practiced frequently in Kato Koufonisi.
Walking and cycling are the only way to reach the beaches of Koufonisia island. There are also small boats that deserve most of the beaches as well as Kato Koufonisi.
If you enjoy cycling, some accommodation provides free bicycles for their guests. Walking is also fun if the weather is not hot, otherwise, it gets very tiring.