In summer, you can go canoeing in or walking around the lake Delsjön. It can be a good way to experience nature.
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Världskulturmuseet
A cultural counterpart to the science-oriented Universeum, it's a museum of ethnography and anthropology, with a thoroughly contemporary approach. There are regular special events such as concerts, films, and lectures. Free entrance to some of the museum's exhibits.
A new museum focusing on the environment with an indoor rainforest, experiment workshop, etc.
Göteborgs Konstmuseum
Housed in a magnificent edifice flanked by the theatre and concert hall, it features a world-class collection of Nordic art (60 kr, people up to 20 years and students with ID free). The adjacent Hasselblad Center periodically holds public exhibitions. The Art Hall (free entrance) features contemporary art.