Spearing. If your fishing a cove or dock were the water isn't moving get yourself some canned mackerel from the grocery store and chum the water now and then. You'll have more snappers than you'll know what to do with.
if theyre not too far out, you can just cast a really light weight (1/12 or 1/8 oz) and a nice shiny hook with a little bit of anything and youll catch some snappers...this is how i used to catch em as a child
Believe it or not when I was young, in the 70's, all my cousin and I needed to catch snappers in montauk from the bulhead adjacent to the snug harbor hotel was a cane pole and one piece of bread. After the bread was gone we used snapper for bait. We caught and released so many snappers that our hands smelled of snapper for the rest of our vacation.
We used to catch a few small mackeral in the mix as well.