Richard,
Thanks for a great and detailed trip report on the Sun Dancer II. I have been thinking about booking either the Belize Aggressor III or the Sun Dancer II for 2018. I'll most likely book the entire boat and couldn't decide between the two but am now leaning toward the SD. I like the fact the cabins are a little larger and the beds are both on the floor. Now just need to decide the overall best time to go.
I have been on the Aggressor III twice and both times in the March/April time of year. Weather was great and diving was fantastic. The dive deck on the Aggressor is one of nicest I have seen.