Mystery walk around Bristol

You might ask what a mystery walk around Bristol and Effective Altruism have in common. Great question!
For our April social we are doing a walk around Bristol. The mystery walk is a sort of escape room level puzzles, with the twist that you are walking around Bristol and using information that you see in the city around you to answer questions. It’ll all be clear when you come, but I’ve been told it’s similar to Race Around The World.
The route is meant to take 3 hours, and at about the 2 hour mark we will be back at St Nick’s Market, so we will stop for food then before continuing.
After that, I don’t know, Pub or something?
If weather calls it off we’ll maybe do a proper escape room or something.