Found the fresh water spring and took the required photos, it wasn't until I read the hint that I was looking for the penny on the wrong object. Penny located, photo taken (for my records) and the date noted. I didn't taste the water but it was quite clear not the golden colour described, maybe after rain?. On the way out I stopped and had a chat with a couple who had just completed a dive, the consensus was good diving but cold. Thanks for the hunt.