VV2 is a great improvement over VV1. I hope that VV3 continues with that progress.

I would like to see:
1)A toilet area built, that requires villagers to clean the area. A place to shower or bathe away from the local pond.

2)Different buildings, A kitchen, a school where kids can go in and learn skills, (the clothing hut is nice but useless until you build those tech points) The hospital is awesome, but I agree it needs to have its own research area. A daycare area so that moms can do something other than carry around the baby. Build a livestock area..to house the chickens ( gread idea)
A church of some kind for funerals, weddings etc.

Map:
A bigger map would be nice, perhaps you can unlock parts of the map as you complete tasks. This would be great, get other puzzles for these areas, that would aid in the village, but are not absolutely neccessary.

I loved the fire in VV2 but how about having to cut firewood, and then pile it for the fire, instead of the neverending pile on the beach. It gets used for everything. How about some bamboo trees, they can be used for lots of things like furniture.

The stews are a cool idea, how about away to keep track of them and what they do. Create different stews with different foods, Need more variety in the foods, Could use the other areas on the map to find different foods.

Give the adults leisure time, have a party or go for a walk.

Build a boat, this is an island I thought the idea would be to get off of it. Could be used for bettr fishing.

Have more collectibles that will give them useful tools, not just the cutting tool. Teach them to build nets or traps for fish and seafood. Different combinations get different tools or toys.

Some different outcomes for the ending would be nice, then you can play over and over changing things slightly to find the differnt outcomes.

Branch off the Tech,
farming...planting and harvesting, cooking,
Science...researching, blacksmithing
Engineering,...building, repairing and upgrading
Medicine...Healing, researching
Exploration...finding collectibles, opening hidden areas
Culture...teaching and daycare, daily living(laundry, cleaning)

There are tons of great ideas in this forum, I hope the developers will implement some of them and make the game that much greater.