There are lots of challenges to be found in driving.
One is smooth driving. Yep, if you own a pretty fast manual car, then trying to drive very smoothly through a city is a challenge, and a nice one too.
But it is the added adrenaline of going fast. Also the knowlegde you can't drive fast all the time, making it more of a treat. Trying to drive smoothly is nice, but it is something you can do all the time.
If I am traveling only through Holland on our motorway (with the 120 Km/h limit), I also enjoy trying to set a new record for making the most kilometres before having to stop for fuel. But, again, that is not very thrilling or exciting. But it is a fun challenge.
Like I said, racing down the Deutsche Autobahn on the derestricted areas is so much fun. Not much thinking time when your doing >200 Km/h. But those excellent roads over at our eastern neighbours are up for it, the car is up to it (i.e. handling, good breaks etc.) and so should the driver.
But I also love just cruising along some mountainous road in the sun. Feeling the car's handling and performance on those twisty roads. Brilliant.
In short there is much fun in driving.
And if you want all the fun, you want a superb-performing car that makes you feel good.