My first response - Outside. And I am not a dad.
We routinely book Starboard. Especially if a balcony cabin - designated smoking areas (including Deck 4 Promenade after 6 pm) are starboard on Dream & Fantasy).
You are going to get coastline views from either side at some point in the cruise. I would look more at noise factors onboard.
But I am not a sit on the balcony and luxuriate in the beauty of the Sea - in private - type of cruiser. If I am up early (rarely happens, but did in Tortola this year), I enjoyed the wide open view from the front of the Fantasy as we neared the island.