Even when Mountain Creek opened and had been running for a few years, some of the original Action Park rides were still operating. The Tarzan swing and the slide with the 12 foot drop into freezing spring water was there until the early 2010s at least as I went there with my youngest son. There was another slide where I would get so much momentum I invariably hit my head (as a 20 year old you don't care, in your 40s you're wondering what you just did to yourself). I would do the freezing water drop but the other slide I just couldn't deal with.
Great memories though of fun times in the 80s. Hard to believe now that we would have gone as teens, but I would go down the shore from North Plainfield just saying i was down the shore for the day, don't hold dinner for me.