I am planning for a day trip to Macau from Hong Kong via Ferry

You can just take bus no. 10 from macau ferry terminal to New road, adn then walk to visit Senado Square, Ruins of St. paul, A-ma Temple, Monte Font, Guia Fort and Macau Marine Time Museum. Then take bus no. 9A/18 to visit Macau tower. Later, take bus no. 18/9A back to New Road to change to bus no. 26A to Venetian, and walk to visit City of Dreams. Finally, take Venetian's free shuttle to The Sand and Fishermen's Wharf, adn then walk to Macau ferry terminal to take a ferry to HK.