Focus on these three themes
Day 1: Sydney Harbour, Opera House, Harbour Bridge and The Rocks
Day 2: Famous beaches (Bondi or Manly) and coastal walks
Day 3: Local wildlife and inner-city neighbourhoods
Travel time and distance from Sydney: About 9 km and 20 minutes by car from the CBD, depending on traffic. Ideal activity length: Half a day to a full day. Cost: Free (unless you splurge on some amazing gelato). Bookings: Nope, just show up and enjoy. Best for: Beach bums and surfers.
Travel time and distance from Sydney: 50 km, and about 1 hour by car. Ideal activity length: Half a day. Cost: Free (except for parking). Bookings: No need, just pack your snacks and go. Best for: Nature lovers and chill seekers.