there's a bait shop in Valpo. Crappies on Bass Lake - there's a good bay on the northern part of the West end of the lake that produces a lot of crappies, also, Cranberry Point is a good place to try. You can always drift across the middle of the lake north of the park and drag a jig n minnow or jig n crawler to try for walleyes. It'll be pretty busy on the weekend, I find that going there in the middle of the week is much better.
Roaming the banks of the Kankakee River and anywhere else fish might lurk.