Vegas is easy to get laid. Don't go to the expensive clubs. I usually just play roulette at night around 9pm. Play very conservative and you can usually be at the table for a few hours and just spend about$60 and you get drinks. The trick is to be at a table with a single woman and then you do things to show her your really sweet. You ask her what her birthday is and then bet on that number. Also bet on her numbers a few times. If you win those then you say something like where have you been all my life. Have some conversation with her and I'm telling you every time I've done that they come to my hotel room. It's that easy.

 
On another note, NYC is great for picking up younger women. They are all desperate to go out. I match with lots of black women between 18 to 25. If I take them out to dinner they usually will come back to my place. Others are looking for the sugar daddy. They will spend the night for$200 . That's all night long and sex in the morning.  This is so much cheaper and better than an escort for one hour.  

Especially with your reference to random tourists, it's unclear whether you're referring to getting laid through any method (civvie and/or P4P) or specifically civvie or specifically P4P.