You can make it into a portion of your larger sunroom. Or outdoor kitchen/grilling space with dining table and chairs. Under a pergola, maybe. It depends on your climate. It could be a raised garden area.

What do you want/need?

It could be grass, ornamental garden, vegetable garden, patio, orchard, skateboard park, fountain garden, pond, bocce court, a place for a miniature Stonehenge, putting green, playset area, etc.

It really depends on what you want to do with it, with some restrictions from climate, exposure, setbacks. . . .