What subjects are you most curious about, what would you like to ask them? You can choose one person from the Old Testament and one from the New Testament.
I'm second guessing myself a little here but with the OT I think I'd go with Eve, there's just so much I'm curious about...did that serpent really talk, did they have a house, how long did they live in the garden before the fall and so much more.
From the NT I'd probably go with the Apostle John, he was close to Jesus, had some awesome experiences and could explain the Book of Revelation. :)
So, how about you, who would you like to have a good long talk with?