We spend alot more time inside in the winter months. I can't say I'm a big fan of the cold and snow, but with kids, they certainly make the holidays a wonderful time of the year. And the great indoors does spur creativity - indoor games and crafts, baking cookies, reading books, and even snuggling on the couch watching TV or movies together is fun.
I find it difficult to find anything that my kids don't enjoy doing at this age! Seeing the world through their eyes is really refreshing and makes us feel like kids again ourselves.