We're typically only weekend sailors and play acoustic guitars. My daughter brings her Laguna up, I sometimes bring my old Ovation. I would NOT bring my Taylor. We don't leave any of them up there during the week as the boat gets awfully warm when it is all locked up (just like we don't leave any wine either :-) ).
If we were going on a longer trip, we would bring my Ovation and leave the Laguna at home for the reasons mentioned above. And ditto on keeping it in the case when not in use. It may be easy to do something stupid at home, it is much easier to do something stupid on the boat as it is a smaller area and inherently less stable.
Enjoy... a beautiful sunset and singing with guitars is a wonderful thing.
"To reach the port of heaven, we must sail sometimes with the wind and sometimes against it - but we must sail, and not drift, nor lie at anchor.”
- Oliver Wendel Holmes