Hey hunny.
How about a choice?!!! your own designed cake? jelly. icecream, sponge, chocolate! I'm sure if you tell G about it then she could get the sibs to make it for you? Whats icrecream cake? sounds awesome! Definetly needs chocolate though!!

(with your number of sibs it would be so cool to make a jelly pool!)...
Why not play the 4th by ear? Be prepared for anything - sunglasses and ear plugs can easily be put away on Thursday if you don't use them! Or, if you get some of the guys to give you a hand up the stairs then you could watch the fireworks from indoors? especially if you can rest at the same time by stealing someones bed whilst looking out the window (can you tell I have done this one before?).
What/ Where is Friendlys'? It sounds rather like Chucky Cheese! ! Going to the mall would be awesome - and as it will just be you with the grampies then there are 2 of you to push you as needed - so if you try not to go OTT on the pushing etc then hopefully you won't flare stupid thing up too much! (Silly question I know, but as you don't go out that much for "you" why not decide now which shops you are going to look at before hand??).
Ok. I have forgotten everything else I was going to say Oops..

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Take the camera!!! and please take a photo of the cake..!!!
Love ya tons babes!!
Froggsy xxxxxxxxxxx