Agree on the Rotax karts, used to destroy clutches and chains sprockets etc, then you have to run different stiffness rear axles for different tracks different jets for different conditions, too many variable for me, I just gave up and stuck with one set up that was ok…
Cycling - road and mtb,
Gym,
Used to motorbike (keep getting tempted to get another, but then that would impact funds for the exige),
Photography - mostly interesting looking stuff like architecture and graffiti
General geekery with hi-fi / home cinema / computers…
Oh and obviously driving and the exige 