1. Bananas can be stored in the refrigerator if you individually wrap them in aluminum foil. They won't turn black that way, they will stay yellow. I haven't actually tried that, I have only heard about it.
2. Try a peanut butter and sliced (raw) banana sandwich, on white bread.
3. Even more tasty, though, is a fried peanut butter and banana sandwich. This was a favorite meal of Elvis Presley. There is probably an official recipe, but the easy one I use is: Fry slices of white bread in a frying pan (low heat), with some melted butter or margarine, until the bread is golden-brown on one side. Then let the bread cool down a little, spread with peanut butter, and add raw, sliced bananas. I think it would taste even better if the bananas were also warmed up or cooked, but I have never bothered to do that part (I'm not even sure how I would do it).