Introverts can do these things, too. I do it all the time, now. It just takes more energy for us.
I am loving this book!! It has truly changed my attitude toward my introvert tendancies, and helped me understand why it is so difficult for me to handle some of the extraverts in my life (thank God I am married to an introvert!). I am finding I am no longer ashamed because I don't want to head out for an action packed weekend, but would rather play with my kids and curl up with a cat and a book.
It is making me veiw my co-workers differently, and my siblings (nope, still can't figure out my parents!). Giving me a better understanding. I have begun to recommend it to my introvert friends so they don't continue to beat themselves up for a wonderful character trait.