If you want to stay on property then what about Shula's in the Dolphin.
It is far superior to any steaks on property IMO.
They do not need to cut corners to support the
DDP.
It you want to travel off property then Capitol Grille is my recommendation, but not worth the trip when you can go to Shula's.
Yachtsman's Steakhouse is OK if you are on the DDP, but not even close to Shula's quality and service.
You may want to ask this on the restaurant board, but I assume everyone will say Shula's or Yachtsman.
Yachtsman has nice choice steaks, but Shula's is the real deal aged quality beef.
Prices are about the same (actually I think Shulas is a far better value).
An 8oz Filet at Yachtsman is about $39.
An 12oz at Shulas is about $43.
Another plus for Shulas is that it will most likely not have many children, if any.
Any DDP location will have many families and children that are worn out from the parks all day.
Something you may not want to deal with for an anniversary dinner.