5 mile wave

 Pretty cool!
  http://www.grindtv.com/surf/blog/23568/surfers+in+alaska+ride+waves+for+an+astonishing+five+miles/

Turnagain arm is pretty cool, though "pristine Alaskan wilderness" it is definitely not. Still, the bore is pretty cool (seen it once) and it's common to see Beluga's when the tide is up.

Of course, when I saw the bore, all I could think of was "kayak time!!"

Scott

That is cool. The phenomenon itself is amazing; riding it, even better.

how peaceful would that be just riding

Totally cool!  Imagine being a newb, sitting there fishing or just touring around, and a series of tidal waves comes out of nowhere!