Comment A mission to a near-Earth asteroid (Score 1) 137
is what I'm most looking forward to. Two Orion modules together would be enough for a mission lasting a few weeks, the almost complete lack of gravity would mean no lander would be necessary nor a rocket for the way back, and it would technically be the farthest we had ever gone. Plus the fact that understanding asteroids will help them not kill us.
A binary asteroid would be best.