This is a concrete park right on the main drag of Sinclair street in Blenheim. After getting off the ferry in Picton, head South about 12 KM. Cant miss it. Metal coping. Lots of space. Chunky rails, wedges and quarters.
In the parking lot adjacent, on weekends there is "car boot sale" where people sell junk out of their trunks. Some good finds, maybe an old deck, if your lucky.