Multiple river crossings required - please exercise caution.
Entering the reserve at the David Mclean Drive entrance will make your walk approximately a 2.6km round trip. If you start at the Old New Germany Road entrance it will be about an additional 2km on your round trip, including some nasty steep gradients.
Once you reach the cascades, proceed to the "Indaba Area" where you will find a picnic table. From there, scramble down the bank and boulder-hop your way to the other side of the river as you approach the cache. You will find what you are looking for in the area a few meters behind the big tree and rock "shelf".
Feel free to take a garbage bag with you and remove some of the litter on your way out.