Over the years I've had success in Vegas every time I've went. The hotels are huge which gives you a lot of options. People are there to have fun, which often involves sex. And most are drinking a lot which can help things progress. You also have a great chance of seeing a couple since they're often mingling in the common areas and/or gambling. Unfortunately on this Valentines Day weekend, I completely struck out. It hasn't happened before. It was at a brand new, upscale hotel and I wasn't very familiar with the layout and rhythm of that spot. Maybe that's why?
Here are a few things that I think improve chances:
1) Older hotels are better than new
2) I tend to have better luck at moderately priced than high-end hotels
3) Party towns (like Vegas, Nashville, New Orleans, etc.) can be very productive
4) But the timing in those cities can be tough - sometimes in the wee hours of morning...like 4 or 5 am
5) Finding locations, cities and hotels where young couples gather increases success
6) Hanging out in elevator lobbies can help you find good candidates
7) By contrast, wandering hotel hallways listening for sounds can also lead to success but it can also be like a needle in a haystack

Any other items that you feel helps set you up for success? I was really surprised at my lack of success this weekend.