Red Rock Canyon
This is a short, easy, paved trail, only a hundred metres from a convenient parking lot. Despite its ease of access, it is a delightful jaunt, both picturesque and full of interesting geology. If you're curious about the water temperature in the canyon, I can tell you that it's brisk and refreshing (even at the height of a hot summer).
Blakiston Falls in only one kilometre further on and well worth the detour.