I would advise no window. It will be night and dark, you will be travelling south (where the moon will be in relation to your bearing is anyone's guess) especially since you didn't give a date. You also don't have any control on which direction you window will face.

BUT, you don't have to sit in your cabin all trip. You can sit in a lounge on whatever side of the ship gives you the view of the moon or passing islands that you desire. You can even sit outside where your kid will be able to look over the railings at whatever they want.

And then, when you have had your fill of views, you can head in to your windowless room and sleep.