After the ferry ride, we went walking to see the Falls from all possible angles and decided to check out Caves of the Wind, an elevator that takes people to the foot of the Falls from inside the hill/cliff 60 feet down. You have to wear a proper raincoat and special shoes they provide. They have made some wooden steps.
The guide takes you to the foot of the waterfalls. There is a platform called the Hurricane Bridge. If you stand there, you can feel the strong sprays of the water. It is not exactly under the waterfall.