We selected the 8.5 hour tour and I had some concerns that the kids might get done with an 8.5 hour tour. However, it was quite the opposite. We took the tour at the end of June. All four of us absolutely loved it. Also, the length of time allowed us to go farther and follow orcas when they were spotted. We also saw otters, a humpback breach, all types of seabirds, otters, seals, and sea lions. We also saw amazing glaciers, of which my 10 year old was in awe.
The food on Fox Island was quite good and the chocolate chip cookies on board were yummy. Being on the deck is great, but wear multiple layers. We wore zip off pants and a thin layer on top with a fleece layer and a raincoat. My 7 year old was chilly and put on his rain pants as well. Also, I would recommend bringing along gloves and a hat. Overall, I would highly recommend the 8.5 hour tour.