we always try to take our own snacks, it sort of saves money and time.
you don't have to stop in every town to get food.
I think the thing you might find hard about your vacation is you're taking 2 different age groups, 1-2 year old, and 10-12 year olds.
you're going to have to find something everyone will enjoy.
amusement parks might not be that great, because a lot of the rides the older ones might not be tall enough for, and the younger ones won't have anything to do.
so you might try to find something like a crayola factory, like I saw in "jon and kate plus 8" on TLC, all of their kids had a pretty good time.
they let them see how they make crayons and I think they let them color and play with some playdoh.
this is just my opinion though.