I looked at the 26 Glacier Cruise fairly closely but chose another. The two boats that Phillips uses are the M/V Bravest - 120' length, 285 guest and the M/V Klondike Express - 137', 332 guest. Both large boats. Phillips says " largest, fastest and most luxurious catamaran in Alaska ". They claim it explores over 140 miles of Prince William Sound. If you figure that the full 5 hour tour is in the water cruising, then your average speed will be ~28MPH. It's top speed loaded is ~32MPH. That's a pretty fast clip for sight seeing. You can read a lot more about the Klondike Express at http://www.nicholsboats.com/portfolio/project/klondike-express. That's twice what we cruise Lake Conroe in our 25' pontoon party boat. I choose not to book their tour due to big crowd and fast touring speed.