A regular stop for tour buses, the lookout for this 'instant gratification' cascade is just steps from the parking lot. Depending on rainfall, the lovely 80ft waterfall can be a torrent or a trickle. Go in the morning and you'll see rainbows if the sun and mist cooperate. Waianuenue ('rainbow seen in water') is the Hawaiian name for these falls.
To get here, drive up Waianuenue Ave (veer right when it splits into Kaumana Dr) about 1.5 miles from downtown Hilo; follow the signage.