Waimea Valley Falls Hike
1.9 miles 272ft elevation Out/Back Paved Trail
AllTrails lists it as Easy
This trail is a big tourist draw also, but is still worth the time to do it. I enjoyed the walk and all the interesting historic structures and numerous different types of plants and trees along the way. There are lifeguards at the end with lifejackets that you wear for safety if you want to swim in the "plunge pool" below the waterfall. I didn't swim in it this time, because I was headed to Waimea Beach afterword.
I didn't add comments for the pictures as it's a paved tourist hike.