http://www.niagaraparks.com/niagara-falls-attractions/white-water-walk-facts.html
we did the jetboat tour one day as a family on a warm July day - an absolute riot! Amazing the power and skill of the operator, just hovering in the water next to Devil's hole and at various points along the way, including where the gorge enters into the whirlpool. The guide said the stretch above the whirlpool would have been too strong for the boats and potentially would rip them apart. We ended up purchasing pass for the day that gave us access to almost all of the features of the park. I was surprised how much I enjoyed all the things we did - under the falls, maid of the mist, walk along the gorge and a bunch of stuff. Its a great way to spend time with the family, although I will say, it was pretty expensive.
This is a vid I made mostly for the family. If you watch just to the right of the bow at about 1.45 as we race up the glen you can see a nice bow jump . Just go to the 1.00 minute mark to see the ride start