Vigeland sculpture park seems like a really popular tourist attraction. There are tons of sculptures in the park. Each one is unique and vivd.
And the park is quite nice to sit and relax and to have a picnic. And not just tourists go there, lots and lots of locals go sunbathing there. Actually it feels like it is more interesting to watch Norwegian people relaxing on the grass as if they are on the beach. They seem to really enjoy the sun. A lot of them wore bikini in the park, and somehow this was normal in Oslo.
Of course the main attraction is still the sculptures. But regardless of how attracted you are towards art and sculpture, Vigeland park is beautiful and happening.