Funset Boulevard is essentially a (mostly) indoor entertainment park in Appleton. There are arcade games, laser tag, an indoor playground, mini-golf, bumper cars, a carousel, and a train. It's pay as you go, but they do offer a couple of package/wristband options as well. If you're trying to get out of the house on a yucky day, it's worth checking out.
3916 W College Avenue ~ Appleton, WI ~ (920) 993-0909
Admission: train ride starts at $1.50, and it all goes up from there