I would just drive around the coast, stopping for photo ops. From St Aubin I would go into St Brelades Bay, only a few minutes drive, then on to Corbiere for a pic of the lighthouse. Down the 5 mile road at St Ouens for a spot of surfing then through L'Etacq and round to the rugged North coast. Carry on to the little bay at Rozel then round to Gorey with its impressive castle. Along the South coast to St Helier for a bit of shopping then back along our only duel carriageway to St Aubin. Inland you could visit what used to be called the German underground hospital but is now the Jersey War Tunnels. The zoo is also quite pleasant.
Enjoy your weekend.
Dennis