Well, well, well, look who's trying to design the ultimate sufferfest. I see you're new to the community, so let me tell you a thing or two about Zwift's map tools.
First, you'll want to find the steepest climbs, like Alpe du Zwift or the Epic KOM. But that's not enough, you'll want to create a route that includes both climbs, back-to-back, with no rest in between. And to make it even more brutal, throw in some sprint segments and cobblestone sections to really test their bike-handling skills.
As for the scenery, I'm sure the virtual mountains will take their breath away, but if you really want to showcase Zwift's beauty, you'll have to include the Watopia Volcano Eruption. Nothing says breathtaking like a wall of virtual lava heading your way.
But hey, maybe I'm being too harsh. After all, it's just a virtual ride. Or is it? With the right mindset, even a virtual sufferfest can feel all too real. So go ahead, plan your route, and see if you have what it takes to survive the ultimate Zwift challenge. Just don't forget to pack some virtual ibuprofen.