There is parking at the temporary Captain's Cove offices; corner of Admiral Way and Admiral Blvd.
The catch is there is a bit of a walk to get to the proper dock access point. You have to walk east along the river walk; about 300 metres to the gate for docks 14,15,16. Jack's boat is at the end of the dock. There is another parking area just off of the boat trailer parking lot at the old entrance to Captain's Cove (end of Ferry Rd). Its about a 500 metre walk though.
You can access Admiral Blvd by taking the 1st exit to Ladner (River Rd) off of Hwy 99 just south of the tunnel. Admiral Blvd is the first set of lights on River Rd (turn right).