I don't think I'm even bringing my board to CPH if I end up going... Some of the spots they skate for CPH Open and Pro aren't really spots. It's just the middle of the street with some random obstacles, that aren't permanent and most of them seem to be invite only according to last years schedule. No idea how long they'll stay around, but I'd doubt it would be over night.. The normal spots are possible to skate before/after the events, but I'd just assume that it will be so fucking crowded that I wouldn't even bother. Show up a week early or stay a week later if you want to skate CPH without the crowd.
Things to do? Danes have some fucked up shit going on.
There is a bar/stripclub/brothel (
http://www.istedgade18.dk/ that serve something that roughly translate into "naughty draft beer", which means that when you order it, the barmaid pulls out a dildo, puts it on the tap handle and inserts the dildo into her vagina and squats to tap your beer. It's super degrading and you feel so shitty when you order one that you want to drink your feelings away so it's kinda a great place to start if you haven't experienced messed up stuff in your life. It's also way more expensive than a normal beer, and at CPH Open there is free beer everywhere. Oh and it's probably mob owned and shit so it's actually a bad idea, just figured that slap would be into it.
Malm? is a 30 minute train ride away from CPH if you really want to skate during those days...
Tivoli is hella nice if you don't want to get black out drunk. They have some amazing rollercoasters, including one that was built in 1914 which is my favorite rollercoaster in the world.
In case someone needs to tell you, drink beer. That's what danes do.