If you have a son, you will LOVE the indoor ball pit/slide area. My kids (almost 6 and 9) both love it. You should also sign up for a Kid's Club evening. You drop the kids off at 5 (if I remember correctly) and pick them up at 10. They have planned activities, you should get a list when you check in. My kids DEMAND to go -- they have been twice. You should reserve because they can only accomodate so many kids. One time they made a bunch of science experiments, got free tokens for the game room, and had supervised play in the huge ball/jungle gym. They still have their bouncy balls that they made. They also get to order pizza. I think it is $25 or $30 for the whole evening. My husband and I went to Boma for dinner and just enjoyed ourselves. They also give you a beeper.
The activities director at the Grande Vista is just wonderful! (I hope it is the same one that we had last year.) They had a "survivor" party that my kids remember to this day! While it was geared to older folks, everyone was just great when my kids wanted to play. (One activity was to see who could eat the gummi worms the quickest. My 9 year old carried that one!) (We also won a T-shirt and a beanie baby!)
There is a full grocery store right around the corner, much cheaper than the one right next to Disney. Oh, and it is much easier to eat in some good non-Disney restaurants. I recommend Bahama Breeze! It isn't that far away from the Grande Vista. Oh, and bring your own laundry detergent! You will love being able to wash your clothes!
Hope this helps,
Katherine