Positano/amalfi

I don't understand your question. I assume that your travel director will help you? But my daughter and I were in Poistano in April of this year and it is truly breathtaking. I recommend getting your feet in the sea and enjoying the view. It's just amazing.

When, and where do you exactly dock? How much time do you actually have on land?

What with the necessity of being back to ship on time and public transit challenges getting around the coast in timely fashion, I'd recommend either a private (most expensive) or group excursion (not as expensive) by a local company offered from your port. It may be that there isn't any tour that will mirror this exact itinerary but could come close.

If Oceania's tour (you copied the itinerary from one of their optional shore excursion offerings) is fully booked, we'd need to know where your ship will be docked before providing recommendations. Also what month you'll be taking this cruise.

If you are familiar with the Cruise Critic website, you could also post the question in the forum for your cruise operator and exact cruise; it's possible others finding the ship's tour booked are also looking for options or found options they need additional passengers to join to keep costs down.

Also: Month and year? Tender port or Docked? Budget? Previous and next cruise port? Number of guests? Any stair climbing restrictions?

I will be there in November. Reading A Lot about the Amalfi coast and the TRAFFIC, I might suggest looking very hard at the ship's excursion as if there is any traffic delays on the ship's excursion the ship will wait for you. You will be on your own if you don't make it back in time.

It depends on where you'll be docked. I think for Oceana it will be Amalfi. Amalfi is easy to explore, you can literally walk right into the city center from the dock and see the cathedral, piazzas, etc. From Amalfi I'd consider seeing nearby Ravello. If you have time you could consider taking a ferry to Positano and back (instead of Ravello) but that would be a lot to do in one day.

We are on a Oceania cruise--does this mean you are taking an Oceania cruise in the coming weeks or are literally on the cruise now?

If you have time you could consider taking a ferry to Positano and
back

Except that the ferries don't run to Positano or other locations on the AC in November. From Positano's official tourism website (for anyone else using this thread for their own planning):

"Ferry routes for Positano, Amalfi, and Salerno run during the tourist season from the beginning of April through October. During the winter months, the only ferry routes active are those between Sorrento and Naples, and Naples or Sorrento and the islands of Capri and Ischia (departing from Naples for Ischia and Sorrento and from Sorrento for Capri). There is no Amalfi Coast ferry from Sorrento or ferry service between Positano and Capri in the winter."

So getting around to the locations listed in the desired itinerary will all need to be via road if visiting in the colder months. That said, because of time constraints I'd skip Positano for sure but we are still missing a lot of critical what/when/where info. clmulvey, please respond????

As a complicating factor, most cruise ships are required to tender, not dock, for AC port stops. That will further shorten the available touring time. The additional information, already requested, is needed to better assist the OP.