If you're looking for high-end Italian, Spiaggia is clearly one of the best around, and perhaps the most celebrated.
(
http://www.levyrestaurants.com/levy/din ... iaggia.htm)
Beyond that, there are many, many, many fine, midlevel, and neighborhood establishments within both walking and easy cab distance of the Sheraton worth visiting, of which Volare is one.
For steaks, a search of Gibson's, Morton's, Keefer's, Gene & Georgetti should get you into the thick of things.
"The fork with two prongs is in use in northern Europe. In England, they’re armed with a steel trident, a fork with three prongs. In France we have a fork with four prongs; it’s the height of civilization." Eugene Briffault (1846)