Most walking tour routes in Hong Kong begin in the city center or a park. If you hire a guide, it will cost around HKD 630 per hour. Children usually don't require a separate ticket.
If you plan to explore Hong Kong on a self-guided walking tour, make sure to take a leisurely walk along the waterfront, capture photos with the Bank of Hong Kong and Shanghai, visit St. John's Cathedral, ride the world's longest escalator to the Soho district, and explore a couple of antique shops.