Both are non-mandatory, but the first carries the connotation that this is something the government thinks you should be doing, but the latter is more like a suggestion of something cool you may want to do, like visit the Vasa museum next time you're in Stockholm.

Yes, they are both voluntary, but the nuance is quite different. That ambiguity in nuance is a problem, given that "recommendation" is the strongest wording for a non-legal mandate the Swedish government will use.