It's a VERY strenuous hike, switchbacks on rocky paths almost almost the way up. Going up is strenuous but very doable, and the view is wonderful. Can be cold at the top and warm at the bottom, bring layers. Have a picnic st the top. Don't forget to go down from the top to the actual falls for the best view.
Going down is more difficult. Hiking poles are highly recommended, and knee braces if you are at all so inclined. Can be very slippery if it is wet.