S.C.
I know its cutting it close but did you check out the Give a Day, Get a Day program that Disney is doing right now? You can find it on their home page. Maybe you have time to get in a volunteer experience before your trip... and get one free day pass for you, your DH and your 8 yr old. There are tons of volunteer opportunties available. Some you only have to commit a few hours of your time.... and the turn around to get the vouchers was really fast (atleast for us it was)! We are planning a trip the end of April and my DH and I volunteered for a local food bank. They had extremely flexible hours & we put in about 4 hours each. Then had the vouchers emailed to us within a few days. Might be worth checking into, if you do it asap!!
Then as the other Mom said, pack lunches & snacks for when your at the park and granola bars, muffins, or something easy to have breakfast in your hotel room. Good luck and have fun!