Manly is a beach situated among the Northern Beaches of Sydney. I prefer it to Bondi as there are less international jet setters. Morevover, to get to Manly, getting the ferry is a wonderful experience; in about 30 min from Circular Quay you arrive on this surfing paradise.
The Corso: here you find restaurants, bars, cafes, a supermarket, surf shops, gift shops.. Also very handy to pick up any beach gear one may have inadvertently left behind (just like me who had forgotten my beach towel! I bought a lovely one for 10$ as the Corso leads right to the beach.
The scenic walk: the Cabbage Tree Bay Walk takes about 15 minutes from the surf club near the South end of Manly, and follows the jagged coastline all the way to a spot called Shelly beach. I really advise you to do this walk, it is very enjoyable.