Organized things to do in Kalymnos are limited as the island is not developed in tourism. Over the last years, Kalymnos is developing as a rock climbing destination due to its granite mountains on the northern side of the island and on the neighboring island of Telendos. In fact, an international climbing festival is organized on Kalymnos island every autumn.
Apart from climbing, hiking is also an enjoyable activity. Hiking trails are actually old footpaths that cross the island and lead to old castles, mountainous villages, small chapels, and secluded beaches.