Silver Lake off Silver Grove Rd. in Stockholm. Monster crappie in there. Good bass fishing as well. I once caught a 11" rainbow while fishing for crappie. Park in lot, walk over to the concrete dam, and cast a senko, 7" worm, or a live minnow under a bobber. Look around, you'll know where to cast when you see it.
I've heard Split Rock in Rockaway is good, but have never fished it.
Best bass fishing in Sussex County is High Point Country Club ( Holiday Lake), but ya gotta know somebody.
Swartswood lake is also very good.