Hey! I think the money is different with each chapter so it's hard to say. We are planning to eat Breakfast and Dinner at GKTW and hopefully the money will cover lunch at the parks. I know they usually allow some money for souvineers too! I would save a little just for backup!
I spoke with our wish manager today and he is giving us a debit card with the funds on it, but some chapters give you a check to be deposited in your acct prior to going on the trip.
From the Trip Reports I've read, it seems people have more than enough money to do a character meal and eat at the parks.