We did the Tribeca/Chinatown scavenger hunt by CityDays. We have never really had a chance to explore this area (despite being NY natives), and this was the perfect way to do it! The scavenger hunt covered a lot of ground (be prepared to walk), and took us around to see some really interesting things. After you answer each clue correctly, they send you a fascinating historical tidbit about the area where you are standing.
Beware, though, the clues are HARD! This is more of like an escape room than a scavenger hunt. You have to decipher a bunch of clues to figure out where to go, and THEN decipher more clues to get the correct answer. Don't worry, though, they give you plenty of opportunities for hints if you get stuck.
Very fun and interesting way to explore the city. Highly recommended!!