If you are looking to boywatch, this is the town for it. My lover and I were just there at the end of July for a day and a half. On Commercial St. go to Spiritus Pizza. There is always plenty of people to cruise, especially at night. On the other side of the street, further down, is the post office. Signs posted say no loitering, no sitting or eating on steps, but there will be lots of guys there. You can cruise other guys on the steps, or you can check out everyone who walks by, as the steps are close to the street. The same is true for Spiritus Pizza.
If you are more adventurous, you can go to nude sunbathing at the beach. Ask someone where you are staying to tell you the best place for this, but we went to the far right end of the beach. It was secluded and quiet. A male/female couple were there about a hundred yards away, and a guy was on the other side of us about the same distance.
After a while this very cute guy walked by and went into the dunes up behind the male/female couple to our right. I could tell he was getting naked but I couldn't see below his waist. When he laid down, he was totally hidden. My lover and I wanted to see if he wanted to fool around, so we went for a walk in the dunes. He was very well hidden from the dunes and the beach, but we made some noise to make sure he heard us. He got up to see what was going on.
We got him to follow us into a grove of trees in the dunes where we had a nice three way. My lover sucked me and the guy, and I sucked my lover and the guy too. I had never had two cocks at the same time. It was incredible. We all ended the session by jerking off onto the ground.
Needless to say, if your looking for it, you'll find it in Provincetown