Plant ground cover and get rid of that grass, takes almost no water and never need to mow it. Make a slate stone path through the ground cover with landscape lights along the path to a slightly raised wooden deck with a metal pergola with moveable canvas panels for sun shade. Like this:
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Run some power or just use a decent Bluetooth speaker setup, the JBL Flips can be linked and are weather proof so you can have several of them running in sequence and they last for like 9 hours. You could do all that for relatively cheap depending on how you want to do it. Or totally do something else, just a thought...