I've done this once. It was OK, but at the end of the day it's like shutting down a highway and letting you bike on it. It's just a huge (from the POV of a cyclist) empty concrete road. I'd much rather bike around the actual city or do a trail through trees with some sights to see.

Basically, it's all of the bad and boring aspects of driving excepts you're on a bike. But to me one of the best parts of biking is that you're not in a cage on a boring highway. It also has big "drive my truck to the gym to do a run" vibes since it's in the middle of nowhere.

That said, turn 1 is a (fun) beast and being around a bunch of people excited to cycle is the best part.