The South Alligator River is a popular place for fishing, and this little park has a boat ramp and gutting station when you bring in your catch. Absolutely NO SWIMMING as crocs are lurking just under the surface.
It's a perfect place to rest, stretch your legs and have a bite to eat with picnic tables in the shade and public toilets.
The cache you are looking for is a camoed eclipse tin with log, pencil and room for little swaps.