If you're looking for waterfalls around Woy Woy, Waterfall Bay has to be the place to start. This cache has a bit of everything - a long steep hike, some rock-hopping, waterfalls (of course) and a kayak paddle. The T5 rating is for the latter element; the rest would be a T3.5, perhaps nudging close to a T4 on the very steep section of the track.
To reach the parking waypoint, turn off Brisbane Water Drive into the cleared area on the northern side of Spike Milligan bridge and follow Lara Street under the railway line at the water's edge. Once you've done the hike you can launch your kayak from here, just be careful of oyster shells and submerged rocks. Either side of high tide will be best, try to avoid low water if you can.
To find the cache, you have to solve a field puzzle along the way. Begin your adventure at the listed coordinates, passing through the gate into Brisbane Water National Park for the rapid climb up to the top of the ridge.
Pause at Stage 2 to admire the view. To find the digit A, which of these Central Coast landmarks is visible from here?
At Stage 3 you'll find a blue water valve in a circular concrete sleeve. On the side of the sleeve is the manufacturer's telephone number starting with a 1800 prefix. The rest of the number is BCDEFG.
From here, take the low road following the white posts. After a bit of a scramble down some rocks, continue along to the Turn Left reference point, then on to the Narrow Track reference point and straight ahead down the hill.
At the creek, the track bends left to follow the watercourse downstream, soon emerging onto the rock shelves leading to Stage 4 at the falls. Here you must identify these falls from the following pictures to determine the digit H. The climb down to where the photo was taken is on the left of the falls but is a bit tricky and shouldn't be attempted if the rocks are wet. Treat any wet rock as extremely slippery until you are sure that it isn't. While these falls aren't particularly dangerous, you could still easily break an arm or a leg if you're not careful.
For a look at the falls without climbing down, you can head up through the scrub on the left and around along the rocks to a good vantage point.
There's one more waterfall to find, but for that you'll need to return the way you came and launch your kayak. Before you do, though, you can do a quick checksum on your answers so far:
A+B+C+D+E+F+G+H = 29
Paddle up Waterfall Bay to Stage 5 where you'll find the falls for which it's named. This time you don't have to match the falls to a picture, that'd be too easy as there are plenty of photos of these falls on the net, instead turn to the left where your GPSr should be pointing and identify the distinctive rock on the bank from these four images. This will give you the final digit J.
The cache is at South 33° 28. FC J East 151° 18. HDA
This is back along the bay and also only accessible by water. It's just outside the official national park boundary even though the signage might suggest otherwise. The cache is a 200ml Sistema with a pencil included. This location is frequented by muggles, if the amount of empty beer bottles is anything to go by, so make sure it's thickly covered with bark when you're done.
Mobile coverage up the bay is good so you can use the checker below to confirm your final coordinates.
Congratulations to bella at waggy, the first to chase these waterfalls!