Fire pit?

Since you don't need any more seating, why not hang a large good quality hammock in that shady area, for a nice relaxing napping spot. I like Brazilian hammocks. Now I need to figure out where mine is packed and find a perfect spot for it!

Outdoor dining table ?

Ping Pong

Love the string lights at night

Would love to put a dining table with lights but that would leave a new spot for me to fill where the dining table currently lives :) you cant see it in picture it is between the covered brown seating area and the blue firepit sitting area which you could barely see

I agree with moving the dining table and adding lights. Then fill in the old dining table's spot, especially if it gets a lot of sun, with a nice vegetable garden: https://www.google.com/search?source=univ&tbm=isch&q=vegetable+garden&sa=X&ved=2ahUKEwjpkLHju6nxAhXY3J4KHR1ZAUAQjJkEegQIBBAC&biw=1226&bih=869&dpr=2 

I was thinking a dining table as well with lights if you don't already have a dining table space. But after reading @chispa suggestion for hammocks, I'm changing my answer to hammocks as well. That sounds wonderful.

Anazing idea. thank you.