Jitterbugs...
In my youth, my first "official" job was as a shoe-shine boy at a local Country Club. One of those real "ritzy" clubs, like the one in the movie Caddy Shack.
One of our "perks" was that we could golf for free on Mondays, since the club was closed on those days. We could golf, but not fish...
Two of the water holes looked too good to pass up though, so I'd toss a collapsible rod in my golf bag, and a couple of lures. The hot one there was always a Jitterbug! Frog-colored or yellow worked well in daylight, and when we'd sneak in at night we used black ones. The water holes were linked to the "outside world" via creeks, so they actually had nice fish in them.
My best there was a 9lb largemouth, but we caught loads that weren't much smaller than that. Those were big bass for us in those days, and in that area (NW suburbs of Chicago). And best of all, it was "private", lol!
Another spot we found that we always did well at was at the Botanical Gardens, where we sometimes went on school field trips (art classes). No fishing allowed of course, but great fishing all the same. Coke bottles wrapped with fishing line, which we'd cast under-handed. The bottle works like a rod/reel combo. Where there's a will, there's a way!