There are 2 bike trails in the La Crosse area, the 24 mile Great River State Trail which starts in Onalaska and continues north to the Marshland access and the 21½ mile La Crosse River State Trail which links to the Elroy-Sparta State Trail. All of these afford a great experience to all levels of bikers.
If you are at all a fan of swimming I would suggest attending a UW-La Crosse swim meet. I swam there while I was in college and it was a ton of fun. Besides you will be seeing the Confrence champs 2002, and 2003 women compete and runner up men compete. The women finished 10 in the nation in 2002. Some of the best D-III athletes go to this school. Besides swimming the gymnastics team and the track team are multi-year national champs!!