Being a former Illinois resident and fly fisher the answer is YES, go fishing! I would highly recommend going to SW Wisconsin using Richland Center or Avalanche as a good base camp. The spring creeks in that area of Wisconsin are wonderful. I truly miss fishing in Wisconsin and try to get back at least once a year to fish with my buddies.
spinner1 on this web site is a guide in that area, you may want to look him up.
Bring some warm PJ's.........still cold this time of year up there!!
ENJOY!
Bob