You have to go to the Harbour Masters Office on the north side of the piles. It's one of the western buildings next to a fish Co-op/processor.
Tie up at the public wharf just past the yacht club and use your dinghy to go over, its faster than walking.
Best to go in on a rising to full tide as its shallow [in 2015] just outside the harbour.
Sorry I couldn't find the phone number.
Have fun [with caution] as you tie up between the piles.