gravel zones
This is one of my favorite routes. It's just long enough, has all sorts of gravel terrain, avoids roads with cars, and most importantly gets you to places you wouldn't want to walk to.
I've divided the route into something what I call gravel zones. I recently rode it with my buddy David and we had a lot of fun. I wanted to share it with you so you can ride it too. Gravel zones aren't hard, but they're not easy either. You're looking at a total of ~88km with around 700m of elevation gain. There will be forest roads, classic Czech rough macadam, narrow single trail and long and wide dirt roads between fields. It is possible that some parts will be a bit overgrown and you will find yourself bushwhacking.
You can top off this trip with a great pizza and a beer at Pizza Hradlo. Check the opening times before you go though.