leaves for college?

I have a short 3 years left before I am an empty nester and I don't want to regret the time I have with him.

For those of you who have the benefit of looking back on your life with your kids at home, what would you do differently that I can learn from?

My son is an introverted good boy who does well in school and is pretty mature for his age. He does not need a lot of friends in his life in fact he is happiest on his own.

What kinds of things can we do together for fun and connection that he might enjoy and remember and I might too!

thanks for any and all ideas!