Ill be travelling to macao for a day in the month of Jan, Need some tips?

Could you tell me how safe it would be to travel by ferry back to Hk in the night? How cold is it during that month?
Secondly I wish to spend time at Venetian and and day out at the central market place of Macao like Senado Square and around places. Could you please tell me Exactly how I should plan this up? Which should be the first place to go ?And How would I commute? Please provide me the Bus numbers etc?