The single most important thing he left me in the abandoned house was a box of old letters, one to a college crush, for example. My father expressed how he was different, socially, and often didn't know how to initiate dating, etc. It hit really close to home, and just knowing that about him was one of the best things I can ever look back on. Finding something in my deceased father's past that was like a mirror into my own person was a truly invaluable find, and you have no way of knowing what traits she will share with you when she is older, and which ones might give her that kind of cherished connection that she might otherwise not know about.
Let her know who you are. Let her know that you love her without condition. Let her know about all the bad choices ahead, and tell her you know that she will handle them well. Tell her that her boyfriend at 14 is stupid, the boy at 16 can't be trusted, and at 25 you are proud of who she's met, who she has become. Write her letters, take pictures, and be honest. Look ahead to when she is 70, when she has grandchildren that you can never meet, but give her things that she can use to introduce them to you. Leave a mark for her to remember you by, and not the fuzzy memories that we all have.
Pick a few things from every year you have had, and just talk about them. And make some for your wife, too. Talk about every date you can remember, how she looked when you first met.