Listening to R&R while walking this morning, and they touched again on post-race nutrition and getting something in yourself within 30 minutes of finishing. This is an area in which I have personally been terrible, especially after the half and that goes double for the full. I recall looking in the post-race snack box last year and not much of it appealing to me, and I don't remember whether or not I had any banana while on the bus or waiting for it.
I think for me the answer is one of the chocolate protein shakes you can get at the supermarket. The ones I'm familiar with have 30g of protein but only 160 calories, so that in combination with some of the carbs in the snack box (or an Uncrustable) would probably work for me. Or do some label reading at the store to find one with more carbs to go with the protein. The nice thing about the protein shakes and the Uncrustable is that they can go into a checked bag and be fine for consumption post-race without refrigeration. Oh, and don't forget to tuck a plastic grocery store bag into your pocket or race belt, and use it for all the water, sports drink, bananas, and other stuff they hand you at the end of the race. It sure beats walking around with your hands full.
Just my 2-cents worth. YMMV. Good luck next week.