Annie is in the northern part of the Park, it’s salt water, open flat area with mangroves, A concrete boat ramp located as you reach the water, A pro crabber lives beside the boat ramp, there is no shade in this area and you will suffer from sand-flies and mosquitoes if it not blowing 20 knots or better. The Annie is for hard core fisherman with boats as it offers the closest and shortest run to the coast
My suggestion would be either Kalpowar crossing, cold showers, toilets. Other campers very close by, upstream from the causeway is an expansive area of water DON’T SWIM in this water way as it has CROCS. Swim in the shallow smaller pools downstream but look for crocs first. Last time I was there I had to chase a fresh water croc from my swimming hole.
Hann River crossing located at the northern end of the park, good fishing at times just below the small waterfall below the causeway, watch for Crocs and DON’T SWIM unless you swim in a shallow small pool between road causeway and falls. The area has two drop toilets but no other facilities, most camp site in this area have good shade. Camp site20 further down has access to upper salt reaches.
Hope that helps