Upper Thomson, 20 km. I used to find this route boring. It's scenic, with the winding road surrounded by trees on either side and occasional non-dangerous wildlife such as monkeys. While there are dangerous drivers, they are few.
I found it boring because the route was short and to stay on it meant loop after loop. Now, as time is short, I take this short route and it is great.
It's marred only by the memory of bumbling bureaucrats who didn't admit they bumbled, much less apologise or make amends.
I sometimes wish I live in another country, where roads, nay, trails, wind through the countryside. Where the only high rises are trees, hills and waterfalls.