Lake Shelbyville is a nice clean pretty big lake. Have alot of buddies that go there to go bass fishin.
Don't know if there are any rental accomodations tho.
Try callin the Ill DNR, I'm sure they would be able to tell you where to go for what you're lookin to do.
They're # for that area is Reginal office # 3 in Champaign ph# 217-278-5773
the main office in Springfield is #217-7826384, either one of those # will get you started. Good luck