That's a loaded question!
Imperial place has a nice car collection on the top floor. Go to the bell mans desk and ask for a pass or just go up stairs and pay the fee.
Not sure what your into but I do suggest eating at Isla inside the T.I. Social House Sushi is also there and very good. Diablos is also good eats. It's across the street from the Harley Davidson Cafe.
Let me know more of what your into and I can make a few suggestions. Also where are you staying?
I'm out of town starting tomorrow or the wife and I would come join you for dinner and a show.