This museum is a little out from the center. Get to the red line on the metro to Ropsten and then get bus number 207 or walk. We were a bit out of the main tourist season but it was nowhere near busy and we were able to enjoy our own lunch in peace in the grounds among the sculptures.
There are indoor exhibits and obviously it is sensible and enjoyable to see them while you are there, but there is no point in going unless you think you will enjoy sculptures outdoors in a lovely setting on one of the inner islands.
I am not into technical descriptions of the sculptures. They are displayed on terraces at various levels and there is always the view to enjoy as well. I am putting some photos on here but if you want to see a lot of brilliant ones and see if you would enjoy a visit, have a look at < a href="http://www.photo.net/sweden/stockholm/milles">the website here.