Before you get too far: WTF = Water Tank Find. This is a tank that used to be checkered like the Purina Dog Chow company logo. One of several tanks in the last couple of years to be repainted a solid color. As of the day I wrote this, the tank is still pictured in Google maps with the checkered pattern.
I first did one of these caches thanks to DudleyGrunt and I'm trying to keep mine very similar to his, so give me a break on the plagiarism.
The park is a dawn to dusk park, so please plan accordingly. Also, use the entrance off of Ridge Chapel Road as there is no gate there. If you try to access from Teague Road, the gate is not always open (it's for the ball field).
You will need the Log Password that is printed on the BITcache to log your find online.
Also, while you are there, please take an "artistic" photo to include with your log. If you have any problems with the photo, it is not a requirement, but I would definitely appreciate seeing them. You do not necessarily need to be in the photo.
For more information on how water towers work (when the military isn't using them to host the alien horde), see this article at HowStuffWorks.com.