For me, it depends on who I am traveling with. If it is with my husband, I spend more because we eat at nicer restaurants and have a few drinks. If I am with my son, we are usually counter service, maybe a sit down here or there like a character meal. He is only 4 and doesn't quite appreciate "finer" cuisine so why bother.
So with my husband, I budget usually $100.00 or so per day, more if we are going out for the night. With my son, if we aren't buying alot of "stuff", $50.00 is very doable.
If all three of us are there (well, it will be four now with our littlest guy) we usually get out for around $100.00 or so a day there as well as we still don't do as many sit downs nor add the drinks.