For downtown you cant beat the location of the Hilton.
It is right next to the Country Music Hall of Fame and the Bridgestone Arena.
It is also within walking distance of tons of bars, live music, and restaurants.
The Hilton has a parking garage and offers valet parking.
I also know that there is a small area in front of the hotel where I have seen expensive cars parked before.
What it takes to get 1 of those spots I am not sure though.
I hope this helps.