Wow - that's REALLY tempting, I may do that later this year!
The coolest & most thoughtful present I ever received was a day driving 6 supercars (Ferrari F430 & 612, Lambo Gallardo, Bentley Continental GT, Aston Martin DB7 & Vette Z06). It was thru 'Players', an exotic car rental place -
http://www.playersrental.com/ I don't they're doing the traveling multi-car thing anymore - it was on public streets, and I'm surprised nobody got arrested!
I wish I could rewind my life back to that day.