Follow the trail at Minnehaha Bay. The entrance is near the marina boatlaunch near Twiggs. You'll see Marina the Mermaid and an outdoor ampitheater on your way to this cache. The cache is located on the same side of the trail as the mermaid sculpture, nestled at the base of a group of birch trees.
There is a Travel Bug for the FTF 
Ba gur evtug fvqr bs gur genvy. Ybbx qbja ng gur onfr bs n ovepu gerr uvqqra va gur ivarf.