How about building a pier to fish off over the ocean.
I like the idea of having hidden features in VV3. For example the diving into the pond in vv2 - I didn't notice that for a while. Maybe a tiny opening in the edge of the jungle that children can squeeze into and play at.
I love the idea of night time. They could light up the huts with candles and have a fire in the centre of the village.
How about making the huts out of something different. All the huts have had some sort of straw, or grass involved, so maybe mud huts would be good (that way they wouldn't catch on fire from the candles).
Different food sources would be great. The basic "fish" is getting a little old but it would do great if they were differently coloured. Maybe magic fish could be worth more food points. (isn't this the same island that fish tycoon got their fish from?)