A Bar
I can't complain about much regarding my hotel accommodations (considering that I'm not paying for it). And in particular I'm happy that the on-site gym is open 24/7. And I can almost understand the lack of a bench press setup. But I can't understand the lack of a simple, plain, pull-up bar. There isn't even a reasonable alternative present, either. That is, sometimes gyms have these bench-press-on-tracks devices, and you can just put the bar on the top rung. No such luck.
Also, all of the treadmills face a wall of mirrors no more than a foot away. It's very strange running, and staring at yourself the entire time. I don't really like making eye contact with myself.