Our family of four (kids are 5 & 8-year-old) will be visiting Cairns Oct. 19-25. We want to do a day trip to the GBR and I've narrowed it down to using either Ocean Freedom, which has great reviews for service, or Quicksilver, which is larger (Not sure I want us in such a large crowd.) but has a semi-submersible and more stuff for the kids, I think. We are beginner snorkelers, the kids have gone once--one likes open water where the fish don't rub against her legs and the other likes shallow water with the fish darting between his legs. Does anyone have any experience with either operators that they could share?