My boys (6 & 8) went on the POR jester cruise, the Sassagoula, in March. They really enjoyed it and it gave DH and I sometime alone. We rented a paddle boat for our own private cruise and had a nice lunch by ourselves!
The boys enjoyed their cruise. It has a Mardi Gras theme, they get cute jester hats (I'll try to download a pic later) and a bag full of goodies. It is basically like the pirate cruise, they stop and look for treasure with clues. The boat did have a covering on it, to protect from the sun. They cruise all the way to Downtown Disney and back. I gave the boys a disposable camera to takes pics along the way.
Also, for those who are afraid there kids won't go on the boat, I know they do a few activities first to get them having fun. They taught them a song (to the theme of If your happy and you know it, clap your hands) and took them on a little walk somewhere to tell them the story of the jester.
My only complaint with this cruise is that no one at Disney seem to know anything about it, as some of you have found out! It is very new and I think we were there for the second cruise! There were only 3 kids on the boat! It was very frustrating because I knew the cruise existed, but it took multiple phone calls with multiple CM's before I could even get it booked! So my advice to those who have tried is to call back and insist on them looking for the Sassagoula cruise. I had called before my trip and the CM said it was all booked. When we arrived at DW, I tried again, and found out I could have any day I wanted! (It runs 3 days a week) Apparently the previous CM was only checking the GF cruise.

(Even though I specifically asked her, "All THREE cruise are booked at all THREE Resorts??" ) Then, even at POR resort, no one knew where it was!!! They had us running in circles! Hopefully this will get better with time!