Most places in major cities do take credit cards. They might not take your ATM card, though- I found that they use a different system for ATM card purchases in Australia, and we couldn’t use ours for that (though they did work at the ATMs just fine). I don’t remember trying to use my ATM card for purchases in Europe (I normally use my credit card), so I don’t know if it would have worked there.
If you’re American, and have a typical American cell phone, it probably won’t work in most of the rest of the world. You’ll have to remember how you managed to meet up and keep track of each other BC (Before Cellphones).
International calls are #*@$**! expensive, especially to or from your hotel phone. Keep your calls home short and to the point, or your hotel bill or next phone bill might have a nasty surprise in it. Email is probably a better option- in most European and Australian cities, we found that there were internet cafes around and that some hotels had computers with internet. Email also helps with the time-zone issue, so you know you won’t get the math wrong and end up calling someone back home at 3am their time.
I’ve never gotten a hair dryer to work satisfactorily with a voltage converter. I eventually ended up getting a 220-volt hair dryer for trips abroad.
But remember, there’s a lot of space between “I will eat anything the locals eat, including head tacos” and “I will try local dishes that look like something I would like and don’t violate any of my dietary restrictions” and “I will only eat at a restaurant I know from home, and will only order things that I could get at home”. Even if a cuisine is not known for being compatible with your dietary restrictions, you can still find new and interesting stuff to try that doesn’t violate them. Mr Neville and I managed to find vegetarian Czech food (Eastern European food in general is not known for being vegetarian-friendly). You really don’t have to be willing to eat absolutely anything to have an interesting and enjoyable experience eating abroad. Nor do you have to drink alcohol, although some of us do enjoy trying local beers, wines, and other drinks.
Warning for Americans who don’t drink alcohol: soda servings are a lot smaller in Europe than they are in the US, and they cost a lot more. I think a Coke costing more than beer or wine was fairly typical at restaurants we went to in Europe. They don’t give free refills, either.
Warning for non-Americans who drink alcohol coming to the US: you’re much more likely to come across a restaurant that doesn’t serve alcohol here than you are in Europe or Australia. If a restaurant does serve alcohol, they might have an outrageous markup on the price (3 or 4 times what you’d pay at retail isn’t that unusual). And house wines at most restaurants are decidedly inferior to what you’d get if you ordered a glass of the house wine at most restaurants in France or Italy.
If you ask for water, in some parts of Europe they will assume you mean mineral water. Mineral water, to me and to at least some other Americans, tastes like really bad tap water- not at all like bottled water you get here. It’s also not free (or even cheap, some places). You should try mineral water at least once, though- maybe you’ll like it.
Some of us don’t have that experience at home, even after living here for nine years… If you don’t have a sense of direction, though, you can still enjoy travelling. Just allow extra time for getting lost or taking the subway in the wrong direction when you’re going somewhere, and make sure you’re not impeding the flow of traffic when you stop to look at your map.
Butterscotches can be good at heading off motion sickness, at least for some of us. I start sucking on one as soon as I start feeling a little off, and it does help. It doesn’t work nearly as well if you wait until you feel like you’re about to puke, though.
I do hope you got some Mexican chocolate in exchange for the butterscotches- Mexican chocolate, with the cinnamon in it, is sooo yummy.