My Williamsburg Vacation!

This Thanksgiving, my kids and I are going to Colonial Williamsburg with my parents! We went to Williamsburg last April and it was really fun. Luckily, Williamsburg is a relatively frugal place to go on vacation, but there still are some costs involved. Here is a breakdown of the vacation costs and my plan to save up enough money for the trip!
Unfortunately, I found out that the economical hotel we stayed at last time is CLOSED, so we'll have to stay at a more expensive one. My total hotel cost for 5 nights will be: $609. This is kind of a blow, because I was anticipating it would be more like, $400!
Since we're staying in the hotel for 5 nights, admission into Williamsburg is free! We're going to be there for 4 days, so the savings is pretty significant. There's a lot of expensive and very tempting souvenirs to buy, but I have a certain budget and I'm going to stick to it.
Here is the money I've saved so far for the trip!
Pell Grant refund: $440
Friend paying me back what I loaned her: $100
So that's $540 saved so far for the hotel. I've got about $200 saved up for spending money, so I think I'm okay there. I plan to bring a cooler and a LOT of food from home, to minimize the cost of dining out! Here is how I plan to come up with the rest of the hotel money! I still need $70.
I won't have to pay my sitter for Thanksgiving week: $30
I plan to try really hard to not spend for the next 2 weeks! If I can pull this off and save grocery AND gas money, I think I can come up with the last $40. I'll have to be pretty disciplined, but I've already saved $20 in grocery money and $2 in gas money! Here's hoping my friend is actually going to pay me back...