And just remember to take some precautionary safety measures.
-Have a place to stash your stuff. People carrying everything on their backs with a camera strap around their neck are prime targets.
-Beware of pickpockets.
-Pay attention to the news. There were two terrorist attacks between all the countries I visited in a month's time. The refugee crisis hit shortly after I'd left. Just remember to keep an eye on your surroundings as well as the architecture and sights.
-Prepaid cellphones, travelers checks, etc... if you can afford to replace something vital with something temporary, it's worth it to do so.
-Ask locals about where you should go in a city or country, and where you definitely should not go. I was strongly advised to avoid Marseille, for example.
-Keep an eye on your drink, and your drinking.
-Be careful about what you leave. I did a lot of biking around Frankfurt and my hosts were really careful to take those strap on headlights you attach to your handle bars with them everywhere, which I overlooked a couple times. Just like in any major city, if you make it possible for someone to steal something, they probably will.
Soap box time: Just remember you're in someone else's country if you start running into problems with people. I didn't have any real problems while I was there, but I had two Europeans with me that were seasoned travelers and it was easy to follow their lead. Europeans, especially in areas with a lot of tourist traffic, are pretty polite and accommodating in general I've found. But that's not all Europeans or all parts of Europe. And I have occasionally brushed by a few people when I've been there who didn't hesitate to let me know they didn't like Americans. Nationalism is a thing in Europe just like it is here. But unlike being French or German or Italian or Korean or what have you in America, in Europe EVERYONE has opinions and preconceptions about America and Americans. Some people really love us. Some people can't stand us. Even if they don't come right out and say something, it may nonetheless color their attitude toward you. I had a couple people in various positions act a little....dickish to me even though they never said anything or did anything overt, and all I did was order a drink or ask for a pack of cigarettes. Ten or so years ago I was in a German restaurant with my family and the guy at a table next to us started talking shit to us in German. The American side of the family had no idea what was going on, when the German side of our family turned and started yelling back at him in German. They never did really tell us what he said. So.....yeah. Generally speaking the smaller, more remote and/or more quaint the place, the more careful you should be about your behavior.
So....mind your P's and Q's, and don't be surprised if someone starts laying all of America's fuckups out in front of you like they're your fault, especially when the drinking starts. Why X in America is dumb or bad (X can be healthcare, violence, criminal law, international policy, weight, fashion, cars, entertainment, news, politics....Trump got elected, so prepare to have to deal with that. Generally speaking Europeans loved Obama, and Trump is basically a walking European stereotype of America. I got asked more than once about Trump. I can't imagine how Europeans are processing that.) If you fancy yourself on the left, you'll probably find yourself agreeing with a lot of what they say. Europe is by and large a pretty liberal place. If you're on the right, it could make for some fairly insulting conversations. If you fancy yourself neither, you'll still have to deal with the tedium of some Europeans venting their frustrations and bafflement with America to you. Whatever your leanings, or whatever they're saying, definitely don't take it personally.
Lastly, just for the sake of appearances, learn the words for Men and Women in Spanish, German and French. Some Germans got a good laugh when I went to go the rest room and nearly walked into the ladies room because I looked right at the sign that said "Damen" as I walked toward it and missed the one off to the side that said "Herren." If it had said "Männer" or "Frau" I might have caught it. There can be a lot of details in European restaurants and stuff that it can become easy to miss little, important details like that because you might be a somewhat overwhelmed by your surroundings. As an American you get used to very commercial layouts and settings that are consistent and, well...soulless. But stuff in Europe can be all over the place and sometimes get a little funky. (Especially clubs, bars and pubs.) Or other stuff like "No Exit", or "Private Room" or even "Danger." I did zero language prep before I went over there and it didn't hurt me all that much because I could infer most of what I needed to. But again, I had hosts who spoke most of the languages I ran into, to keep me from making a complete ass out of myself. But I made a couple dumb, somewhat embarrassing mistakes as well.
Man I'm like 90% of the way through my massive write up and photo bomb of my trip to Europe. This kind of has me feeling like I should really finish it and post it.