A lot to think about...
First, your comments in reply to fish. I have always said that in some sense, I've been such a successful vegan in part because my body is really resilient to just about anything - I've never said that it would be as easy for anyone.
That said (and speaking here as a science geek, not as a vegan) the arbitrary line of "fish" as something a person eats versus doesn't eat always struck me as a bit odd. I've had pet fish for several years now, and they really run the gamut in terms of intelligence. Some fish like tetra don't seem to notice you except as a large, potentially dangerous object passing by, others like cichlids and pufferfish engage in play, beg for food, stare at you while you're working, etc. It's always hard to judge animal intelligence, but I've certainly had experience with fish which seemed more intelligent than most reptiles and amphibians I've dealt with. And it's been established scientifically that fish do actually feel pain. On the other end of the scale, invertebrates don't seem to feel pain. Indeed, some like clams and scallops have secondarily lost their brain. If I ever went back to eating any sort of meat, I think I would do only inverts - both for those reasons and because they're lower on the food chain, and have less of an impact through wild harvesting.
I have thought about the questions you brought up regarding travel before. I have to admit in the past I've avoided traveling to non-English speaking countries to a wider extent mainly due to concerns about finding food. I could see cases, particularly if I was traveling somewhere like India, where I knew I didn't have to worry about factory farming of dairy cattle, where I might eat some things with dairy products in them. Overall though, there's more experiences than I can have in one lifetime as it is.
As to your final question, our daughter is going to be raised vegetarian, not vegan. I don't think you can explain easily to a small child why she can eat the cookies at home or at the co-op, but not the cookies at her friends house. Since I'm the one doing all the cooking, I'm sure she'll eat almost entirely vegan at home though.