See all Things to do in Karlovac Karlovac for: Adventure, Food And Dining, Art And Culture, Nightlife, Spa, History, First Timers, Family, Romance, Shopping Swimming / Rafting / Kayaking About Swimming / Rafting / Kayaking. Great swimming in summer months in Karlovac rivers Korana and near by Mrežnica with rafting and kayaking. Add to Wish List