Living Small in the Big Smoke

As a first step in our attempt to live small and ethical, we've become homeowners! My wife and I bought a small house in Toronto with huge potential. There's a lot of space in our new-to-us, little, semi-detached bungalow. It's the ideal location for our attempt at a cleaner, more ethical, life. Green features include:

1. A stone's throw from a subway stop - we get around by Rocket!
2. Right off the Danforth for shopping - no car required
3. No parking spot - good thing we don't own a car.
4. Small home with radiant heat - more efficient than electric and forced air (especially if we can retrofit an on-demand water heater).
5. Large yard with FOUR MATURE FRUIT TREES - can you say homemade jam and jelly? Plus garden space.
6. No contribution to urban sprawl

There are a few things we could do to improve it, such as install an alternative power source, or put in a solar hot water heating system. I'm not sure if we'll be able to because there's a really tall house to the South of us, so they may be blocking our sun. Still, it's a big improvement from the 1950's era, poorly insulated, drafty, inefficiently heated rental property we're in now.