A good set of lights can provide enough background stimulation to set the mood for parties. Fortunately, they are no longer expensive or hard to come by. Amazon is not just for color-changing dorm room light strips.
If you enjoy the smell of woodburning, you can expect to pick up an external manual firepit for anywhere from under $100 to about $250. Gas fires that start with the flick of a switch start at $500 and go up to several thousand.
Floorspace is often overlooked in backyard settings, but rugs can play an essential role in upgrading your connection hubs. If you live in a climate with dry summers or have a canopy, you can lay one center under any firepit or outdoor coffee table.