http://www.murciatoday.com/daily_events_diary.html
Holiday Saturday so shops closed. try events calender above . Murcia city has a dance festival
Cartagena always good , trip on boat around bay lunch on La Patacha floating restaurant
http://www.lapatacha.com
http://www.murciatoday.com/6th-to-9th-december-caravaca-de-la-cruz-mediaeval-market_14019-a.html
medival market Caravaca you could do route over mountain or motorway Mountain route takes you past Mariposa
or take toll road to Mojacar - white pueblo village
and of course Puerto de mazarron and a trip from La azohia , Isla Plana Church and Bol Nuevo going to end of hill for a view of bay as mentioned always impressive