Like people, pool halls have different personalities. Some are quality lounges for serious players, while some are smoky dives. If you're planning to take guests to a pool hall, be sure you pick one that fits their expectations, or your visit might be less than enjoyable.
If you're visiting a pool hall just for entertainment purposes, be aware that -- depending on the type of hall -- some of the people there will be hustlers, hoping to earn money from you. It's best to say no if anyone asks if you want to play for money.