This park really needs something a little easier than the nearby Mystery caches.
The location offer multiple entry/exit routes, each with their own challenges: a couple of M2 crossing points to parking (gated); or the scenic route from W Pymble, crossing LC River; and don't forget the walk via Busaco Trail and North of the Uni playing fields.
Here you may enjoy the wonders of artificial grass with rubber granules. I suggest a quick read of the Wiki on 'Artificial Turf' - especially the Environmental Footprint section... It still seems unclear if this rubber stuff is good or bad for us long term ;) - I'm guessing it negates thousands of reusable shopping bags. ( I do believe I spotted 3 huge sacks with cork granules - Way to go Ryde Council ! )
PLEASE Replace As Found including camo, and Do Not leave spoilers (text or images) in the online log ( 'cuz that would change the D rating and spoil the fun for the next searchers..)