Xpost: Anyone been to Copenhagen or Finland??

So Dh and I have a wedding in June in Turku, Finland. Its a very close friend of ours and we are making the very very long trip. (and expensive trip lol)

So we will be in Turku for 4 days and then Copenhagen for 4 days.

Has anyone ever been? Suggestions on things to do and hotel accommodations??

Apparently in June in Finland they only get 4 hours of darkness....not looking forward to that part!