Stay away from people trying to sell you stuff on the streets. I've noticed these people in italy and france. They don't exist in germany, though.
And wtf? No Berlin? The future capital of Europe :P
When I was in Berlin, nobody tried to sell me stuff, but there were a lot of people who tried to make me sign a paper and donate money.
OT: The London Dungeon is very fun and entertaining. Actors show you the stories of Guy Fawkes, the plague, Jack the Ripper...
I'm only going to be in London to get a tattoo.
Dude, you're cramming in too much! That list is like startung in Seattle, going to LA, to Houston, to New Orleans, to Washington, to Chicago, to New York or something. Europe isn't THAT small. You won't be able to see much of any location.
Nu tip is to avoid the usual tourist traps, don't go to the Louvre in Paris; you don't wanna stand in line for two hours when you have so little time in each city. Maybe just wander around. Or make a short list of places you wanna visit and see in each location.
In reference to the above, I'm mainly going to be getting tattoos, so the short stays are kind of appropriate to what I'm looking for. But I also want to see a bit of stuff while I'm there. And yeah, I'm not really that interested in the museums or tourist traps of that nature, but more like small hidden gems, or anything occult.