Bill in Houston from Houston on 7/28/2020 2:48:59 PM:
The gravel sucks way more energy out of you than you'd expect. Set reasonable goals, take plenty of water, plenty of calories, a spare tube/pump, and a happy attitude. It's a really nice time.
As far as hills, because of the gravel it all feels uphill. :) Besides that, you don't really notice hills.