It's not critical to have a boat as you can catch fish off the beaches, but it will feel a little like being the pool boy at Hugh Hefner's playmate party with all the boats running out to the Caves, Mussolini Rock, the lanes etc - and coming back loaded with salmon... there but not really involved.
I think of it as a filler between runs out to the action more than a shore destination. You can rent a kicker boat for reasonable money, split it with another angler and it gets pretty cheap for a day out there.
I would suggest bringing a compass or better yet a GPS handheld in case the fog rolls in. Stay away from Slip Pt during big tide changes, come inside the bay on the flood if the east wind kicks up and you should be all set most days.