Animal garden - this island is home of Skansen, among other things. A place reserved for cultural highlights of the city. We were there to visit the aquarium, but took a walk along the waterfront back to Kungstradgården T-bana. Find the aquarium was a bit of an adventure, most other things on the island are well signposted. Its hiding behind an arthouse, but we found it across the no-mans-land car park from Grona Lund.
The aquarium itself, although quite small, is nicely set up. With a number of sections, including a rainy rain forest and a (thankfully non-smelly) sewer. We had lunch looking out over the Baltic harbour, across to the cruise liner dock on Södermalm. Watching the Waxholms Bolaget ferries sailing back and forth. This is a wonderful location, worth the entrance cost on its own, never mind the fisk.