Plenty of homes in Scotts Valley and the San Lorenzo Valley sit on a slope, and for a lot of owners the back yard is just a hill they don't use. With the right mix of walls, steps, and drainage, that slope can become flat planting beds, a path to the garden, or a spot for a table.
Retaining walls do the heavy lifting. Stone, block, and timber all work, and the right choice depends on the height, the soil, and the look you want. Walls over a certain height, or walls holding back a driveway or structure, need more engineering, so plan those carefully.
Drainage is what makes a wall last. Water building up behind a wall pushes it over time, so every wall needs gravel backfill and a way for water to escape. The same goes for the yard as a whole: downspouts and runoff should be directed away from the house and the walls.
Steps and paths tie it together. Timber or stone steps set into the slope make every level reachable, and a layer of bark or mulch on the beds keeps soil in place through winter rains. Build it in stages if you need to. A good plan lets each piece fit with the next.