I third the walking and the sex. When I had my VBAC baby, we were coming home from a mardi gras parade (we live in Louisiana, just so you know why...lol) and we were parked far far away....so we were walking, walking, walking...it was quite a hike!
We came home, put DS to bed, had sex.
Seriously within an hour...the contractions started full on...holding my baby that night!
Me (30), DH (31), DS (3.5 yrs - 5/07), DD (1.5 yr - 2/09) via VBAC!!! DS (newborn - 11/10) via natural VBAC! 2 angel babies - 06/06 & 04/08