I'm an introverted person. Before I had kids, I was content to simply snuggle under the covers and read all day. Oh, I still did things like see movies, talk with friends, and check out interesting things around town, but I still gravitated towards solitary activities.
Having children changed all that. I still love having time alone, but that doesn't happen too much anymore. We've found that it works best for us to get out of the house at some point during the day. There will be occasional weeks where we go, go, go and then the next week just veg around the house, but for the most part, the kids are happiest when we do something different outside the house once a day.