Man there's just not much for parks around Baton Rouge anymore, especially fishing too, there is a place off Hooper Rd it's has walk trails & a couple nice ponds, if you're interested I'll post ya the directions it's not hard to find. It's about 4-5 miles when you get off I-110 at the airport exit.
http://www.brec.org/index.cfm/park/detail/17