And for those of you who prefer people watching; this is the spot for you too.
There are many other areas in the city where you can bath too, Sandgrundsudden (where the museum is) is centrally located, Gubbholmen is many 5-10 minutes by foot from the centre (by the stone bridge) and if you choose to stay at the Scandic hotel at Borgmästarholmen there is a perfectly shaped sand beach 20 metres from the hotel!
The bottom opf the river is mostly made up of sand so it's nice. Most parts of the river are very shallow; for instance today when I bathed at Borgmästarholmen I could have walked all across the river. Some parts are NOT shallow though and deep water may come quickly so take vare. And also: please remember that you're bathing in a river: currents may be strong cetrain times (although I've never experienced any current at all.

