Looking for ideas on what to do with extra room

[Anayo Awuzie]

Hi everyone, 

I'm looking for ideas on what to do with this extra room in an Airbnb I'm setting up near Dallas. The place has 3 bedrooms already, a dining room, and basically two living rooms (one I'm converting into a small office). There is this extra room that leads to the backyard that I'm not sure what to do with. The obvious answer is to make it an extra bedroom but I'm not sure if I want to do that as it doesn't have a closet and due to it's positioning by the backyard I'm not sure if it's enticing to sleep back there? I might be wrong. I was also thinking of a game room.

Here is what it looks like. To the left is the dining room and the rest is facing the backyard.