It's touristy - but its actually really cool. I just took my nephew after not having been there for a decade or more. Sorta spendy, but the restaurant up top has done a full 180 and is actually quite good.
The park's central location and its outdoor cafés makes it one of the most popular hangouts and meeting places in Stockholm. It also hosts open-air concerts and events in summer, while offering an ice rink during winters.