Depending on how much time you have in Sydney, I'd highly recommend taking a drive up to The Newport in the Northern Beaches.
There's an awesome bar called The Arms, attached to a restaurant called The Newport, address: 2 Kalinya Street, Newport, New South Wales, Australia.
Hard to explain how awesome it is - but, imagine the best local pub / proper drinking establishment + a world class restaurant, together overlooking spectacular beaches. No need reservations, it's open dining on the property. If you can find parking down on the beaches, take a dip.
Also... just go to Bondi Beach, swim in the pool, swim in the ocean. Grab a Negroni at the restaurant Icebergs at happy hour. Then walk over to The Stuffed Beaver and smash some beers + a burger.
If you have less time and want something simple - drive to Balmoral Beach, get a beer and food at the Boathouse or Bottom of the Harbour.
My wife is from Sydney - I've spent a lot of time in the ocean, drinking beers and eating the foods - don't worry about sharks, they put big chain link fences in the water to keep them out. Just don't question the fences reliability, it'll ruin the experience.
