My daughter came a week late, so I don't have much advice. The week or two leading up to her arrival, I did:
Primrose oil up there (ick) and orally
Sex
Walking up and down stairs
Nipple stimulation
Lots of walking
Spicy food
The day I went into labor, we had the non-stress test, still no progress. That day, we walked and walked and walked... running errands, etc. I lifted my 3 year old nephew and carried him a bit. Ate ice cream. I did hear from a couple other people that they ate ice cream the day they went into labor... dunno, worth a shot? At least it's tasty!