A good question, it depends on which 'house' I'm currently living at. For my current situation
http://www.goddessfarmandmassage.com/, I'm trying to Just think about the food.
Install
perennial beds:
medicinal herbs, perennial salad and salad flowers, perennial braising greens, get perennializing abundant
roots going, and lots more berries, asparagus, rhubarb, and artichokes.
Also, add
trees and shrubs that will hang over the forage areas for both the
chickens and the goats
(different areas).
What I like to also fantasize about though is:
Beef up the wildlife corridor, make more habitat, be able to harvest more from its edges into zone 4
Graywater/raingarden
Insulate the house! that alone would be awesome!
Create some
solar access/thermal mass area so at least that could be passively heated part of the house.
The really juicy stuff, like photovoltaics, I haven't even let myself think to. There's so much that needs to be added to the whole house eco-system. Later I'll think about what needs to be taken out and changed. or maybe I'm just doing first the cheap stuff that I'm confidant with