On personal vacation I tend to go with the "you only live once approach", but it helps that both of us eat pretty cheap (no alcohol, few appetizers or desserts, etc). So in the grand scheme of things, while I could pull it up in GnuCash, I can't tell you off the top of my head how much we spend on while on vacation.
Having done international travel for business recently, I can say it varies a lot based on where you are. I blew an entire day's per diem (about US$60) on dinner in Sydney (by myself!). I had a nice meal, but it wasn't THAT nice. But when I was in other parts of the country I ate very cheap (bought muffins and OJ at the local store for breakfast, made sandwiches for lunch, etc). So the US$60/day was too much except for the nice dinner in the big city. Generally traveling alone I probably spend about $30-40 on meals and snacks per day (realizing I also spend a bit more traveling on business because I know it will be reimbursed). But at the same time I was on the losing end of the exchange at that time (AU$:US$ was almost 1:1 when products were priced more for when they were about 1.5:1).
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Having done international travel for business recently, I can say it varies a lot based on where you are. I blew an entire day's per diem (about US$60) on dinner in Sydney (by myself!). I had a nice meal, but it wasn't THAT nice. But when I was in other parts of the country I ate very cheap (bought muffins and OJ at the local store for breakfast, made sandwiches for lunch, etc). So the US$60/day was too much except for the nice dinner in the big city. Generally traveling alone I probably spend about $30-40 on meals and snacks per day (realizing I also spend a bit more traveling on business because I know it will be reimbursed). But at the same time I was on the losing end of the exchange at that time (AU$:US$ was almost 1:1 when products were priced more for when they were about 1.5:1).
Hope that helps...