Stamina:Running and using tools would deplete this. Could be recovered by laying down in beds, sitting down on chairs, and maybe floating on your back while in the water.
"Health":Not in the traditional sense, but don't you think its weird after running into 5 trees you can still swing an axe perfectly?Could be recovered by buying medicine from the store.
Hospital PWP: This would be on main street and could be used to recover the Stamina and Health I mentioned earlier aswell as getting rid of those pesky bee stings. Also maybe if Lucky went there enough times he turn back into a normal dog villager?
Cooking: Different fruits could be cooked and combined to make new foods. Once upgraded to T&T Mart cooking items would be sold to make even more different foods. These would also be recorded in the cookbook, basically an encyclopedia for food.
"Buffs": If you made and ate certain foods you would maybe be able to running faster, use tools faster, and maybe recover stamina faster.
have you heard about harvest moon? it has basically all of this
i dont think this system would fit with animal crossing ...