Picton's  locality makes it an ideal place to spend a few days exploring. One such excursion could well be a drive through Waikawa Bay over the hill to some beautiful bays of Port Underwood and back to Picton via Rarangi and Tuamarina.
There are several walks in close proximity to Picton with splendid views of Queen Charlotte  sound and the local area. Picton is also in the Marlborough sounds with it's 1500kms of shoreline. If you are feeling adventurous try The Queen Charlotte Track This will clock up 70 km one way. Search their site for transport options unless you want to tramp there and back again. Another facet of  Picton is the maritime history and the preservations of The Edwin Fox and The Echo. After you have recharged your batteries you should be ready to hit the road again and head South down the East Coast or West towards Nelson and down the West Coast.
Heading south will bring you to the wine making district of Marlborough and into Blenheim. The sunniest place in New Zealand is here.