I'm planning a European vacation but hearing that I should hide the fact that I am an American makes me think that that whole continent doesn't deserve for me to spend a dime of my money over there.
I would never dream of mistreating a European guest to my country.
In my opinion you should still visit Europe but leave that expectation at home. It doesn't work like that here and experiencing that would be part of the reason to come. You would not be mistreated.
The advice about disguising yourself as a Canadian is because certain aspects of American foreign policy are not very popular in a lot of nations and cultures
outside America. Again in my opinion I don't think you should do that, just be yourself but I would have thought it obvious that you can't expect your domestic values to be valid elsewhere.
For Shotgunneeley, if you have some freedom in London The Natural History Museum is well worth a visit. Also the Science Museum is nearby. You can also go to the top of St Paul's Cathedral very cheaply for an hour in the afternoon, used to be 4 p.m. but you'll have to check on their website, dash up to the top of the dome for a great view of London (be careful on the spiral stairs, you will see

). If you can get away for a day, take a trip out to the R.A.F. Museum (London) it's actually outside of London in a place called Colindale (formerly Hendon). If you have a full agenda I'd consider calling in sick and buggering off there anyway, entrance to the Museum is free and you could spend a day there and trust me, you wouldn't regret it. Take your camera. Also try to go for dinner in a Curry house or a Balti house if you can find one. Indian culture and cuisine is an important part of British culture. Do not order a Vindaloo or a Phaal:-

The Paris underground Metro is fantastic and you can pop up all over the place. You have to see the view from the Sacre-Coeur Basilica and if you have a spare €50 (joke, but it is expensive) get yourself a coffee on the Champs-Elysees and watch the world go by for twenty minutes. Although I've not been to them there are apparently some very good WWII museums in Normandy, this one in St Mere Eglise:
http://www.youtube.com/watch?v=NgYZRaOAnMYAlso some other videos about the beaches on Kiwitedferny's channel there, including some insightful information from a guided tour which you should watch before you go.
I have not been to Cologne in the daytime or to Berlin but Germany is very interesting and nice. Do not mention Ze Vwar
