If you stay near at the Senado Square, then you can walk to Ruins of St Paul's Church, St. Mominics' Church, Monter Fotress and Macau Museum. You can choose some of them according to your time. Then you can take bus from Lisbo or 新馬路Avenida de Almeida Ribeiro to Ama Temple or Macau Tower. Then go to Taipa at night. Visit Rua do Cunha for Macau food and Venetain. Venetain has free shuttle bus to the ferry terminal. Then back to Hong Kong.