No, no, that's what I meant, Trog, "Yes it is a water tank and no it is not a hot tub. Yet."
I'm not certain, but I think it's at the first more developed facility. Whichever one it is, as you come into the parking lot the ladies' is on the right and the path leads from the left of that building and around to the right in the back of it. I think there is an emergency telephone on a pole just in front of where the path begins.
Happy hunting! How will you explain to your travelling crew that you'll "just need a sec to find the nasty water tank?"
Susan