Thanks janeoc and CarolinaSailor (for answering my question on the covid thread).

Our kids have been snorkeling almost as long as they have been able to walk so I think they'll be ok there, but sure don't want to wear them out with a long swim. I need to work harder to think of more ways to keep them engaged while sailing. I wish they liked it more than they do, but on the other hand am grateful that they do like it some. They are definitely excited about this trip!