The little stream running through Happy Valley is actually Shark River. In the early days of Port Elizabeth Shark River used to be the town's main water supply. Shark River isn't really much of a river anymore and the water gets pumped from the bottom pool back to the top of Happy Vally which means that it doesn't have a river mouth into the ocean anymore. In actual fact the Eastern Province Rugby Stadium and the suburb of Forest Hills is situated in what used to be the river valley.
I remember when we were small and we got to visit Happy Valley, I always wanted to cross the stream over the rocks in this picture. Now when we go there Chaos Boy is the one who wants to do it (and it gives me an excuse to do it as well).