Do you remember your first date? Do you have a favorite song that you and your significant other enjoy listening to? Incorporate these concepts into the day such as having a date at the same location you had your first date. Those first date memories will come back, and you can ponder on why you fell in love. Adding little touches unique to your relationship will make the day more romantic.
This was not our first date, but it was a place that we considered important in our life as our love romance was very serendipitous!