Take the ferry to Manly and stroll along the Manly scenic walkway. Keep going and you'll end up on the 9km bush walk to Spit bridge, or just stroll for a few kms and enjoy the harbour views.
Cross the corso to the harbour beach and walk to Shelly Beach.
Have lunch at the Boathouse at Shelly Beach or the Bower Restaurant and Fairy Bower. look out for Fairy Penguins along the way.
Equally wonderful is The Pantry restaurant on the beach front over looking the surf.