Fishing Derby Prosper

I saw this event going on tomorrow in Prosper. Anyone have any comments that has gone before?

I'm thinking about taking my son (4 yr), but not sure the best setup I should use for his line. I'd be open to any comments or suggestions. I'm a novice that has used mainly crappie jigs/tubes/minnows. He has been wanting to go fishing but I want to find a place where the odds are in his favor for his first trip.

Thanks.