There are two types of resorts that would be my favorites.
One would be a resort in a historical building. That sort of character and charm just cannot be created in modern buildings. Examples would be Stouts Hill, Sutton Hall, Broome Park, Thurnham Hall (original building), Knocktopher Abbey, Chateau de Maulmont, Chateau Country Club de Tredion, and Schloss Grubhof.
The other would be a nice resort that is directly on a nice beach. For a beach-oriented resort being on the beach rather than having to walk several blocks or even drive to it is critical. Extra amenities are good, but the most important amenity is being right on the beach. Most of the examples I can think of here are in the Caribbean or on the US coast. Most European beach resorts I have been to have had the actual beach a bit too far away though some have been waterfront. Also, when I say ''beach'' I mean a sand beach. I have been to resorts in Europe that were on stone beaches, but you had to walk a distance or drive to find a sand beach.