There are these tables on the Discovery.... Also, as to the ship's layout, you could have checked the deck plans beforehand. You could have known where the gym was.
Why isn't it a good start? You booked the cabin you wanted at the price you wanted. Now, you just want to upgrade for less... there may not be cabins available to bid on. Princess has to keep cabins for guarantee assignments and emergencies. There are never any guarantees with the bidding process.
Update to the Discovery. Captain Holland will be leaving the Discovery on 11/25/23. I assume Captain Smith will be returning then but there's no way of knowing.