Energy, Water and Entertainment
Turn a wild, green field into a second home with garden sheds, seats, fireplaces and decorations. Invite people over and share your place, some might give you intersting hints, some give you missions, others might help you install and run more advanced structures (like solar panels and hydroponics).
As the garden gets more sophisticated, you might want to automate your irrigation, fertilization and control growth factors (like temperature in greenhouses). This opens up the next level of gardening:
In the beginning you can get water and energy by running a generator and having a water tank. When you show some gardening skills, the city can install power lines and water pipes, so you can just buy the utilities. Later on you can produce the energy yourself by installing wind and solar generators and use water efficient methods like hydroponics.
[Read more about the science]