Aww, that is a sad lil' gym ;) Makes me think of the exercise rooms that some motels have. But at least it's free!

I'd blow off all the machines and just use whatever limited floor space is available, for bodyweight exercises and/or weighted exercises with the dumbbells. If there's enough room, maybe you can jump rope in there too? Also, I'm not sure what kind of "seat" the machines have but if one is stable enough, it could be used for jumps or step-ups.