Personally, the days of crazy fast speeds on public roads is pretty much over - there have been just too many times where I've gotten the car back home and thought "holy crap, I'm lucky to have not got caught or blew a tire and crashed." It's enough of these "thank god I made it" sessions that got me worried that my luck would eventually wear out.
I live out in the sticks, and I'm surrounded by very twisty canyon roads that can be fun and scary without going so fast that I'll end up in jail. I have plenty of fun trying to drive 'perfect' through the twisties - clean and legal line, smooth, under control but still fast enough to scare the hell out of most people who ride with me. Some of the hairpins on my road are scary at 20 mph in a regular car, yet the speed limit is 40 mph - so there's plenty of room to have fun and still stay within legal bounds.
It's actually even more fun at night - you can see the headlights coming from far away, so you know when you need to take it easy around the blind corners. The blind corners are what can get you - even if you're going 'slow' you can run into situations where an idiot decides to try a U-turn on a two-lane double-yellow road and you've got nowhere to go but into them or into the creek.