I peel, cut them in 1" chunks, and freeze them in a Glad bag (or whatever it's called) and have never had a darkening problem. I love smoothies so I throw them in a smoothie maker, usually with some strawberries and milk or yogurt. My favorite is using the WW chocolate smoothie mix with milk and adding some chocolate DaVinci syrup along with the frozen banana. I actually like my smoothies really thick, like soft ice cream.
Women who behave rarely make history.