Im pretty sure we are going to goto Sebastian again that weekend also. An extra net you may want to buy is the bright handled ones they sell at bass pro shops/walmart. They have l;ike a 1.5 foot handle, with a 6 inch or so wide net. It was perfect for scooping underneath rocks once you turned them over. You dont need anything to catch crabs and snails, but for the most part you will need a seine net for the fish.
Also, I would recommend some sort of water shoe. I went without last weekend, and my feed still have gashes on the bottoms. Rocks and Oysters will cut your feet, dont try to be brave, its not worth it.
Christie, based on our experience last weekend, the best place to go is the south side of the inlet, river side all the way at the end where the pavilions are.
We will probably go straight to the park and get there around 9:30, in an attempt to snag a pavilion.