Amazing hike but it is very challenging. I've done it twice once with rain and once without. With allot of rain it's even harder...and dangerous. Bring lots of water and proper hiking shoes you'll be allot happier. The falls and the views of the coast make it all worth it.
Better be fit as there are hundreds of steps leading to the top! Once you get there you forget about any effort though. The views are beautiful and you can spend there a few hours just admiring the surroundings.