"Isn't it funny how we can each have such different reactions to places? I guess that's what helps make the world go 'round!" T
Try a line similar to that. You most likely won't change their minds so it makes no sense to try -- and why should you or your daughter have to defend your choices to these people? I find the best thing to do is acknowledge their comment and move on.
Personally, I love to travel and, like you, was very fortunate that my old job required some pretty interesting trips to some fascinating destinations. I tried to never engage in a debate about where I was going since, really, I had no choice! Still, like you, I find travel pretty much anywhere broadens the mind and your horizons. When I went places I really didn't want to go I found an open mind on my part made the trip much more pleasant -- and I usually wound up with an experience or two that changed my mind.
We've been pretty fortunate as a family to have some travel opportunities and I think my kids are more accepting of others and more adventurous because of them. I recently made my 20yo renew her passport. She doesn't have any immediate travel plans but I figure it never hurts to be prepared!
Keep opening doors for yourself and encourage your daughter to do the same. The wonderful experiences that come with travel -- the food, the people, the landscape, the culture, all of it! -- will keep us all going and growing. Bon voyage!