. Lots of books
. At that age our daughter was happy for us to read the same ones over and over so we got a lot of mileage from the books. If you have a music
system then CDs are good as well.
Puzzles and games with lots of little parts
, bits and pieces can be a problem keeping together.
If you haven't experienced this already, we found when cruising with our daughter that one of us had to be 100% focused on parenting all at all times. With two on board that meant we were essentially sailing singe handed since only one person would be free to do boat things like sail handling, docking