My girls ages 10 & 12 will both have:
$25 disney gift card (from their birthdays)
$25 that we 'gift' them at the beginning of each trip
and additional money earned by doing extras around the house. Right now, dd10 has about $25 beyond that and dd12 has about $7 (guess who isn't motivated by money!

)
My 6 year old son will have $25 that we have gifted him and $25 he has earned in 'extras'.
Our policy with them is as follows:
They get their one snack credit (
ddp)each day to spend on a snack any way they see fit, their meals (and usually another snack) are covered and we usually buy a family type gift each trip (hats, usually....we love hats for some reason!) Beyond that, the kids must use their spending money for additional snacks/treats and any souvenirs they want.
We don't allow purchasing on day 1 because we find they are so excited they impulse buy and have buyers remorse later on. We have found that it's better for them to see the variety of what is there and save their purchasing for later on.
Three trips running that dd12 has come back with money to spare and dd10 is tapped out. The 6 year old spends all his money in the pirate store and the star wars store in about 12.2 seconds.
