You will need to navigate over several small streams to reach the finale GZ. You should be able to make it without getting your feet wet... if you are careful. Please use care and caution.
You will find clues within Stages A through D to help you solve this puzzle. In case one of the four is missing, A,B,C,D = 16
Puzzle GZ - N40 58.8AB W74, 08.3CD
A - GC4TR39
B - GC4TR6Q
C - GC4TR7F
D - GC4TRFZ
A special thanks to LeftyLeo, whose cache "Lower Pond", GC24QKC, brought us here in the first place.