Poker room or poker at a casino
Sportsbar to watch a game, I'll settle for a BW3 if that's all I can find. Sometimes I can't even find that so I order take out and watch it in my room. I take a google chromecast with me so if a game isn't on the hotel tv hopefully I can stream it off one of my devices
Shopping at stores that aren't in my hometown
Swimming in my hotel pool (if it has one).
If I'm feeling brave I will eat at some fast food restaurants that aren't anywhere near me. Popeyes and Tim Hortons are two stops I like, and immediately regret after eating.
If there's a unique restaurant near my hotel I will stop in and have dinner. I have been known to take an OTC friend along with me on occasion, but a lot of times I like to eat in seclusion, at the bar.