Sydney my one of my most favorite cities in the world, it is definitely one of the most beautiful.  There are many hotels to stay at but the Westin at Martin Place, the Sheraton on the Park and the W on the wharf at Woolloomooloo are my three favorites.  Each has great rooms, service and unbelievable views of the city especially the W which is the best!  Walking around the habour is a sight to behold and the views off the world famous Opera house are some of the best (shaped like a nun's habit).  I recommend trips to Botany bay, Bondi beach and Centennial park.  If you have time to walk across or above the Harbor bridge, is an experience in itself.  Two of my favorite bars to hit are the Luna Lounge and Jackson on George, your shout!!!  Make sure you hit one of the restaurants on the harbor for some kangaroo and a few VB's (Victoria Bitters), whatever you do in Sydney or anywhere else down under is NOT to order a Fosters;-)   Before you leave hit the aquarium and the casino for a game of two up (make sure you toss), definitely an interesting and memorable experience on a crowded Friday night.  G'day!!!