Three days is a decent amount of time to experience everything Sydney has to offer. Some ideas for your itinerary:
Day 1: Take the Bondi to Coogee Coastal Walk, have a bite at the Coogee Pavilion, make your way to Newtown for some shopping, craft beers and excellent eats.
Day 2: Explore the Sydney CBD! Start your day at the Rocks, make your way to Luna Park then end the day at Circular Quay.
Day 3: Escape to iconic Manly and explore the many beaches, restaurants, and breweries.
Check out our full 3 day itinerary.