A little heads up: Most of these tips are aimed at Paris. Not that our visit to London wasn't great, but being from a big city like Chicago, I was pretty prepared for what it would be like in London. If you're not from a big city, make sure you do even more research.
If Brad reads this, he'll probably laugh out loud, because I did the very opposite of this... oops! I always get nervous about not having what we need on hand and hate the idea of spending money on something we have at home. But just try your best to pack light. If you'll be taking public transportation (like one my upcoming tips), you'll have to carry your bags on and off trains and buses. Just pack light. You'll thank yourself later for doing this!
Use public transportation
Cabs are very expensive in Europe and really aren't as frequent as they are in big cities like Chicago. Buy a public transportation pass and use it as much as you can. It may take some extra planning ahead of time but you'll save a LOT of money if you choose public transportation over cabs and car services.
I hate that I have to even give this tip, but you wouldn't believe how many people (cough, Americans, cough) we saw wearing sports t-shirts, beat up athletic shoes, and ratty jeans. I'm not saying you need to spend a lot of money and buy a whole new wardrobe, but try to dress nicely. Think business casual. Parisians really put a lot of thought into what they wear every day, and one of their biggest complaints about Americans are how we always look frumpy when we travel. I know you want to be comfortable but you will feel more welcome and like a real Parisian if you dress up. Plus it's your honeymoon! These pictures will live on forever! Make sure you look great!
Learn the language
By this, I don't mean you need to be fluent in French. But try to speak the language a bit. You will botch it and chances are that they know a good amount of English. But the French are very proud of their language, and they should be--it's beautiful! They will greatly appreciate your effort if you try to speak a bit of their language. Also, do not assume that all French people know English. Many of the young adults do because they took it as a second language in school. But there are still a lot of older Parisians who do not speak English, so you may need to point and smile. That's okay! I took French in high school and college, and I still wasn't very good at it. Just have fun and give it a try!
Plan ahead but be flexible
It is a very good idea to plan ahead and know what you want to do each day in order to make the most of your time. However, there will be instances when you need to be flexible because of rainy weather, confusing museum hours, and more. If something goes awry, just have fun and make a change of plans. You're in Paris! Some of our most memorable moments of our trip were when we did nothing but just walk around the city with no set plans and just took in the sights of Paris.
Yeah, so these tips were mainly for Paris... oops! But I hope it helped a little bit! We had such a wonderful time and I hope that these few tips will help you make the most of your honeymoon abroad!