The off season so would not expect too much happening as far as the tourist is concerned. We also forget that as it is the "slow" period many places may be closed as they take their holidays when it is quiet.

December to February marks the winter season in Palma Nova and the resort is very quiet at
this time of the year. The winter here is very mild compared to winter
in other European countries and although it offers a great escape from
snow and freezing temperatures, visitors should not pack their bikinis
and expect to return home with a suntan.

there will be a few bars and shops open in day time.less at night.time of year you go into the city shopping maybe,or go to porto pi shopping complex..