Katariina Seaside Park is an extensive outdoor recreation area created in the former oil port amid the ruins of the Ruotsinsalmi fortress. You could spend an entire day in this park. The park has a wide meadow area, with sheep in the summer, a Moomin playground, and plenty of opportunities for skateboarding. You can go fishing, play disc golf, play the drums and have a picnic in one of the many barbecue areas. One of them is a stone table, which is said to be the largest picnic table in Finland, for 50 people by the sea.
A meditation labyrinth modelled after the medieval Chartres Cathedral, with a 525-metre route to its heart, has also been built in the park. You can also learn about lighthouses in the Eastern Gulf of Finland, by means of scale models. You can walk between Katariina Seaside Park and Sapokka Water Garden along a path on the coast, while admiring the seascape.