If you suddenly realize that your life is no greater challenge than to surprise the one that next to you, you should not be banal and buy her flowers or invite to a weekend in Paris.
There are simple and true means to surprise your mate. 1. Casually inserts into his speech about it that will make her believe that you are not so simple. Eg. "During my work on the seventh Violin Concerto ..." "Such large losses our family did not carry the era of Ivan the Terrible ...", "... and then, count, comes to my butler ...", "Just before you take part in the six-day bike marathon ... "