I was planning on going over to Keystone on the 6th for a couple dives. Probably be on the 12:30 ferry over to Coupeville from PT. 2 dives, then back on the 6pm ferry putting me back into PT around 6:35-6:40.
Do you have drift diving experience? One of the dives there can get some decent current going at times. Should be there right around slack tide, but you never really know.