Best bet is to hire a guide. Rick Grassett and Pete Greenan come to mind as a couple of the best. Night time dock fishing isn't for the unfamiliar. And No, I don't see any way of wading for them; docks are, by definition, in deeper water.
Be aware that snook is closed here on the west coast due to winter losses the last 2 years, so you can't keep one. We've had a very mild winter this year, so the fish will probably be moving toward their spring haunts early.