Just before the vista point you have a better chance of catching the rainbow.
There is also a set of steps and path that takes you down to the base of the falls. Realize that one is starting at 7000+' elevation to begin with and you have to climb back up the steps when done.
I can not help but wonder how much the drought is having an effect on the falls. I am guessing that getting this close is easier than it used to be in the past. I know that during the spring you could not do this because of the increased runoff from snow. Anyway, people where actually swimming in the pool in front of the falls.