Disney World on a Budget

My family is spending a week at Disney World in Orlando, FL.  My in-laws are paying for the lodging and tickets.  Can you say blessed?  We are responsible for the costs of meals and souvenirs and ant other 'entertainment' type expsenses for the week.  My wife and I set a budget for the week of roughly $1100.00.  Today is Day 2.  We spent yesterday travelling down here (11 hours).  I am excited about the fun things we will get to do as a family this week.  No doubt some memories will be made.  I'm really interested in us keeping 'in budget.'  While I tried to account for everything, all of us personal finance writers know that the 'unexpected' can happen.  My hope is that any of the 'unexpecteds' will be minimal.

What about you?  When was the last time you went on vacation?  Did you make a budget?  More importantly, did you keep it?  What advice do you have for me or anyone else who is making vacation plans?  If you have any  personal advice for "managing Disney World, I'm "all ears." :-)