R13 and R16, by busy I mean a hotel that gets a lot of businessmen, conventions, and clients, as R20 said, pilots. 9, 10 o'clock is later in the evening for me.
This is true in any city. As a traveller, it has worked for me. Once in Munich, I came back to my hotel after dinner with friends. It must have been between 9-10 p.m. Went into the bar off the hotel lobby, sat at the bar and had a drink or two. Noticed a dark-haired man at the other end of the bar. Started to exchange glances with him. He was fit/fat type of guy. When I left, he followed me. Smiled and said hello at the elevator. Once inside the elevator, we started kissing, and he invited me to his room. We had a good time. Looking back (and as a word of advice), it's smart to let someone know you're going off with a stranger. I like to think that I have street smarts, but you never know.
It doesn't have to be a hotel bar. What works is to be chatty, friendly, and have some confidence in yourself. I like visiting the gay districts of towns I visit. I go to academic conferences that are usually in cities that have some gay district or neighborhood. In Chicago, for example, I had dinner early one evening at a nice restaurant in Boystown that the concierge recommended. Since I was alone I sat at the bar and chatted up the bartenders, flirting with one (dark-haired, fit/fat type...setting up a pattern here LOL). He in turn recommended a few places for me to visit, including "The Lucky Horseshoe" and "Sidetrack." At the latter, I chatted up a late 20 something guy. I like to flirt, and I flirted with him. He told me that he had been a figure- skater, but he had never amounted to much of one. I remember telling him that figure-skaters get nice butts from all that time on the ice and asking him if I could cop a feel of his. He wouldn't let me, but I could tell that he took it as a compliment. Knowing that I wasn't getting any further with him, I went of the "The Lucky Horseshoe." It's a bit of a dive, but...hell...what fun! Stood back and enjoyed the show. One of the dancers was the kind of guy I like (not yet fit/fat...looked more like he had been a jock in high school or college). At this place you can hug or slow dance with the guys. Tipping helps. I got to do that with him. He let me feel him up, and even put my hand down his jock. He even let me kiss him, but not on the lips. When I asked why, he told me he was married. I respected his boundaries, and had a grand old time!!!
Leaving the strip joint, I was euphoric from the good time I had had that evening. And I was horned up. I went back to the restaurant I had started the evening at to thank the bartender for his recommendations. It was just about closing time there. I had a beer, and in the course of the conversation, he offered to go back to my hotel with me. And the rest was history...
So, I don't know if I'm an expert at cruising, but it works for me. There are plenty of times cruising doesn't work. I'll go home to Mr. Red Palm and his Five Friends. And that's okay. When it works, it's a combination of factors illustrated in my adventure in Chicago's Boystown one evening. I'm reasonably good-looking. I exercise regularly. If I go out, I make sure I'm well-dressed and well-groomed. But it's attitude that's key. Be friendly, be confident, and especially be interested in what the object of your affection/lust has to say. Listen more than talk! I might have hooked up with a guy in Munich with more knowing looks than talking. But I had a far greater time and more success in Chicago just experiencing the nightlife and conversing with guys.
Next weekend is the Pride Parade and various events where I live. There's a boutique hotel in the middle of the town and a small gay-owned hotel with a small bar and restaurant. I plan to stop in at both places. Wish me luck!