Question
I live in So. California, where the sun goes across my patio from the East, to the West in the afternoon.  Inbetween there are some shade times on a planter area of my patio that is about 6 1//2 feet long and 3 feet wide.  
The rest of the patio is red brick.
The planting area is empty now. It needs soil to build up the area (that is surrounded by bricks).  What kind of soil?
What can I plant that does not take time and attention? I don't have the patience to go out there and water and take care of plants daily or weekly.
Maybe some kind of a cactus?  or ?
I do not have a Green Thumb!  My thumb isn't Any shade of green! !

Answer
Very good potting soil with good drainage and nutrients, is all you will need to fill your planter.
The first plant that came to mind is. . .Ice Plant. . .
When I lived in S Cal. I always enjoyed seeing it in bloom, when not in bloom it is a nice plant as well. It is easy to grow, and care for. Just plant, water some times, and leave it alone. Give it plenty of room to spread. Don't over crowd it with too many plants. It will do better with water, especially on hot days, but it will stand some drought.
There are some very nice cactus, and succulents. Because you will be using this planter as a way to decorate your patio, choosing plants that are very attractive, and colorful. Choose one, or two different plants, then get three or five of the same color. This is the design basic, simplicity, unity, and good visual appeal.
There are some herbs that are also drought tolerant. But, they may require more attention. I have had good success with prostrate Rosemary. It tends to drape over the side of the planter, doesn't need much water, and has nice blue flowers.