Botany and medicine
Since you get sick at the drop of a hat, it would be nice to see more medical options other than shelling out cash at Detroit or waiting it out and hoping you get lucky.
To that, adding medicinal plants to botany (and possibly tracking?) that can found and brewed into teas & tinctures would be nice. Pulps that can be used to treat bruises and help disinfect cuts would be nice as well.