I don't think anyone will wonder whether or not the groundhog saw his shadow today. Here in South Bend, we have several weeks of winter left to enjoy. When the roads become passable again, take advantage of what our mamma (nature) gave us. Go tubing at St. Patrick's Park.
This county park, just off Auten Road north of the city, does not close down after picnic weather is over; rather, it offers several reasons to get outside in the cold. First, the inner-tubing hill. It's open on weekends from 11am-5pm, and for $3, you can rent a tube for the afternoon. (Sleds aren't permitted -- head south of town to Marion's hill for that.) If hurtling yourself downhill doesn't appeal to you, take advantage of northern Indiana's topography for some cross-country skiing on St. Pat's many (flat) trails. You can rent ski equipment for $10, and a trail fee applies.
For more information on inner-tubing, click here.
For more information on xc skiing, click here.
Check conditions at http://www.sjcparks.org/ -- there's even a webcam!
For readers residing a bit more on the Mishawaka side, Ferrettie/Baugo Creek County Park also offers inner-tubing, and snowshoeing. Check here for details.