It would be great to have a function with locations of events/places. So when you're on a family trip and you're driving through Somewhereville, you can say that someone was born, married, lived, died, or was buried in that city. With a little research, you might be able to find a grave, locate an old home, etc. It gives you a reason to look up that relative and learn more about him/her.
It would be swell to be able to map your trip on a map, and filter (for example) within 50 miles of the planned trip route, and have little markers come up on the map. Or if that's too hard, pick one location and search the vicinity. Instead of relatives near me, it would be family history locations near me.