Piston Broke Multi-Cache

Walking one quiet day along Cabbage Tree Creek after rain I heard the pleasing toc toc toc of (Marsh?) frogs in one of the open wetland areas, and saw about 10 species of birds, including two Egrets spearing Mosquito Fish with monotonous accuracy.

WP1 can be reached there, from the north east west or south (news), and an answer can be found on one of the old signs near the path* to help find the coords for the cache. It's then a couple hundred metre walk/ride and a few short steps, to gZ. Some stealth may be needed. Good luck.

*A question to answer at WP1: How many coloured rectangles inside the Legend box? (a= )
Solution:
a=a+2

S27 23.205 E152 56.7a1

After signing the log you might like to try the following in random (just kidding) order: Carry on across the bridge, turn left (SE), cross another two bridges and a street, continue to the boardwalk, turn left. Some paths lead off to various other places but the main pathway here will get you quickly back to WP1.