I would like them to add more ways to plant and harvest fruit in the game. Such as bushes (blueberries and raspberries and strawberries), the ground (watermelon and pumpkin), etc. Also for things like ground it might be cool to have garden patches, where you bury the plant and water it, but maybe for the ground types they could only be harvested once and you have to maintain it until they grow. So my list it:
I think being able to grow veggies would be cool. You could have a little section of land where you could grow certain things...
And melons and strawberries would be cool just because I think seeing their design around town would be cute.
They should totally add a 'farming' area somewhere in town, kinda like how they added the Harvey campsite. You could have plots of land that you would have to take care of, and you could grow things like melons and berries.