I know couples where the answer is "Paris"; couples where the answer is "in the woods"; couples where the answer is "On the plains of Thunder Bluff in World of Warcraft."
Well, actually, I only know one couple where Thunder Bluff is the answer, and they don't keep a very clean bathroom.
According to me California, United States is the best place for romantic vacation the Sandy beaches and dramatic ocean surf attract romantics to Carmel. Between Pebbles Beach and Big Sur, Carmel has an abundance of beaches, parks and the beautiful Carmel Mission and Museum. The area is amply stocked with romantic guesthouses and inns.