Did I peg that location or what. I used to castnet live bait there when I was a kid about 25 yrs ago. The pond is actually connected to the intracoastal by an underground pipe or used to be anyway. The pond is/was loaded with pin fish, sand perch and mullet. We always went there if we couldn't find the mullet anywhere else. I'm not sure how many ponds are on the course but the one I'm talking about is just south of the parking lot, I think. Been years since I trespassed there, since I turned 18 actually.
The bait you see is sounds like mullet. Turn your flashlight off (I know you're using one) and get used to using the ambient light to track the school and cast net them. Your flashlight will spook them and they'll dive deep and resurface somewhere else.