Thanks! I am thinking that we should have enough education opps to mix in with the regular work. I included the tour with interactive ruins time, visiting the village school to donate and observe, stingrays at CC, catameran at CC with history of island, possible research for Cozumel since we have nothing planned there, plotting our group's location on a map to note the States figuring distance traveled to reach the port & find out who is going the greatest & shortest distance, interactions with CMs to find out about where they are from, and ask the Captain a few questions. Of course, I could also include something about budgeting for the trip or gas milage on our way to the port. He is learning how to use a calculator (they have to use one for the EOG tests in 3rd grade) so he could figure that kind of stuff out. He can do the math work before the cruise either before we leave or on the trip down to get it over with. I want him to keep a journal this trip too. He really liked having one last year.