Aaaargh, so much choice... And that's just the motor racing.
My father didn't approve of my interest in motorsports back when I was a schoolgirl, so it would have to be one of the race meetings I'd have wanted to go to but wasn't allowed. He used to get drunk so couldn't take me. I always regret never having seen my favourite driver (and teenage pin-up) race, so I think that's what it would have to be.
Of course I'd take my camera along and take as many photos as my memory cards could hold. And maybe get some of the photos in my collection autographed.