Eiger Nordwand Reverse is a lot of fun in the shifter kart - Turn 2 (before the tunnel) is flat out but scary, the kart gets real nervous if you keep your foot to the floor, turn 4 (after the tunnel) is almost flat out, you can hold a nice slip angle throughout that whole corner, feels good to do. After that, you're heading down the hill, across the bridge to the uphill hairpin bends. Right at the braking zone is a large bump for the kart which causes it lock it's brakes if you're aggressive, which becomes a handful when you hit the steep incline, but it's manageable. From there you can choose to take the following hairpins sensibly or drift the lot of them by keeping your foot down, bags of fun.
Also me and a few buddies run the shifter karts at Daytona Road course online regularly. Not that exciting in a shifter kart until you get to the start/finish straight, those painted lines are lethal bumps in the kart, expect to do several wheelies and endo's if you give it a go, which when there's a pack of you side by side, is interesting to say the least.