Glad y'all like the leaderboard! Thanks for letting us know this is something you'd like to see more readily.
Here's our announcement about it when we launched gamification. We use this gamification plugin from Discourse. By default it doesn't add a super visible/navigable link to the leaderboard - I do think we could make this more visible!
Sounds like it'd be worth doing something like adding a button to the nav bar up top on the forum that links to the leaderboard, or maybe adding a custom hamburger menu with a link to the leaderboard 
We'll scope this out and keep you updated here if we add that after testing it out on staging.
For now, I created a topic with a link to the leaderboard and FAQs, which I've pinned so it shows up when you click into "Topics" on the upper left side bar. Not the most visible spot, but it's a start!
Ok nearly time for dinner - maybe I'll get tacos. Wonder where I got that idea 