For your consideration. Last year for our 45th anniversary, I surprised my DW with a new diamond eternity ring. It took a lot of effort to conceal the ring in my luggage and in the room so she wouldn't find it beforehand (thankfully there's only one key to the in-room safe). I secretly made an ADR (then PS) at Victoria and Alberts. She knew the ADR's for each night of our trip however, I left Tuesday night "open" so we could be somewhat spontaneous. That night I suggested we go to the GF and have a drink in the lounge. Afterwards I suggested we walk down and take a look at Citricos menu. When we approached the restaurant I steered her to the door of V&As and said let's see what's in here. Even after entering the restaurant she still didn't know where we were. When seated, during the champagne toast she received her new ring preceded by some very personal words only she and I will ever know. Needless to say the dinner was "magical" and the staff (who were in on the subterfuge) did everything they could to make this truly a special night.
Several months later, in planning our next trip to WDW I asked DW if she would like to have dinner at V&A's again during this trip. Her reply was, "No, nothing could ever match that evening and I want it to be my memory of V&A's forever".
Well, we see about that. After all we have a 50th coming up in four years