I think that it would also be cool for aesthetics as well.
Recent community posts
Underwater playing is something that I wanted to suggest myself!
Perhaps even a shark cage of sorts with limited durability would be cool on top of your suggestions.
Those sunk ships(or simple chests and barrels lying around for a treasure hunt) could maybe include spices such as salt and sugar...
I don't know if anyone had this particular idea, however(as opposed to some of the more complicated things others had mentioned):
- Simple physics, perhaps light waves.
- If there's too much weight on one side, the raft could start to tilt(and possibly tip).
(The weight thing might be too much, not sure)