For me my most romantic memorable date was in NYC.
This was before we were married, but this was a Valentine's Day date. He brought me roses, took me to an off-Broadway play, then for a carriage ride through Central Park-- it was a full moon and cool so we were cuddled up under a blanket with hot chocolate. Then we went for a drink and a late seating supper at Tavern on the Green, there was big band dancing (I love old Big Band music, my dad was really into it so I grew up on it).
Another more recent memory is when we went to the Epcot together and soaked in the great atmosphere, had drinks and snacks in a few different countries, did some shopping-- but as an old married couple I'm not sure it counts as a date, lol. But it was romantic for me.