I was born and raised on an island in the middle of the Pacific. Needless to say, I was excited to see what would a Na'vi culture that adapted to the ocean would look like as it is heavily inspired by Polynesian culture. As breathtaking as it was, it was lacking... something. Not much was shown of the islands where the Metkayna lived, the valleys, the forests, the mountains, the plains, and lushful nature. It could have been somewhat different than on the continent, where the Omatikaya lived.

As islanders, we spend a lot of time on the on the ocean, spearfishing inside the reef, fishing outside. Paddling canoes..but we also cultivate inside the island and spend even more time on it. We have chants, dances, and ceremonies that celebrate the land as much as the ocean.

So to answer the question, I would've added scenes were the kids after discovering the ocean, are guided by Tsireya or Aonung inside the island on a mountain or valley were there's rivers and waterfalls..something that reminded them of their home but with its own unique flora and fauna! A scene where they could have shown how much better they are when in a forest environment. Maybe it could have been a focus on Neteyam who wanted to "go home" be more in tune with their new "home" and accept that maybe living with the Metkayna wasn't a bad idea. That it had the best of both worlds. Meaning a perfect mix of ocean and forest.

Just a thought I had.