I am really really sorry to say this, but unfortunately acid is very hard to come by here in Denmark. I really wanted to try it out (before it became obvious to me that I probably shouldn't because of my mental health is quite unstabil)... I still have a dream of trying it someday, but yeah...
Then comes E and GHB I think. But that is just me, I suppose. I was lucky to be offered E once, but the guys connections failed and we never scored unfortunately.
The easiest is probably hash/pot/skunk, heroin and cocaine. We have Christiania, which is like going to Holland on good days, lol... (Loooots of hash, you can smell it from all around the gates of Christiania, lol). I loved being in there a lot when I was younger. Now, I hang around on Istedgade to get heroin if I want to go out. I have anxiety of leaving my home though so I get someone to buy it for me, but I used to visit Istedgade a lot before. And learn about tricks on the street and you probably all know that, hehe.