Here are some of things which got fun after I quit drinking:
Go to a bar late and night and see how stupid all the drinkers look, and how loudly they talk. After 5 minutes it gets boring. It is a reminder that "euphoric recall" was at play more than true fun. (only recommended after a bit of time sober!)
Wake up in the morning and notice what it feels like to not have a hangover. Go for a walk. Call people you saw the day before and know exactly what you said to them. Look people in the eye and not be concerned that you offended them or embarrassed yourself.
Notice details which were previously blurry. Share feelings. Watch movies sober which you saw when drinking. It is amazing how much more there is to those movies!
One thing which shocked me when I quit drinking was how much of the world does not revolve around drinking. There's plenty to do!