You have three good options as far as boat ramps go, Stumphole, Lowfalls, and Packs. All three ramps are in the uppermost end of Marion and all offer good crappie, bream, and shellcracker fishing within a short boat ride from ramp. Crappie can be caught in and around any grass, lily, and blowdowns you can find with decent water in them. Minnows and jigs are best baits. Targets will be plentiful so patients and trial and error are essential. Better option will be to pursue bream and shellcracker using crickets and worms around cut grass, cypress thickets, lily and grass mats.