Left picture courtesy of PPJ.
The clues to AG#25 - Secret Waterfall are placed in the following Waterfall caches:
You should walk downstreams from the cache site, as you can see more of the waterfalls there.
The cache is a 1,2l. icecream box wrapped in blue plastic bag, containing a log book, pencil and the Geocache info sheet. It contains a disposible camera, so take pictures of your visit 
Please don't reveal the hiding place nor the waterfall in your logs