Uncle Tom's Trail, Brink of Lower Falls
Throughout my three summer working in the park, I've done every trail associated with the amazing canyon with the exception on Sevenmile Hole. Hopefully I will knock that one out this summer. Hiking to Point Sublime has to be my favorite trail in the canyon area.
We hiked on the South Rim Trail and went down Uncle Tom's Trail one day while visiting Yellowstone (in '97, I think). The falls were amazing.