Make sure you bring water and sturdy shoes for hiking the trails. The short trail to the big Falls has rails to the viewing platforms but also lots of stairs, and the ground is quite rocky.
This is the perfect family day out, romantic date-day, even proposal spot (wink wink). They have picnic tables, toilets, parking, and we saw people of all ages and massive family groups - so come one, come all!
This really is a must-do in Perth, and totally doable as a day-trip, so add this one to your to-do list - you won't regret it!