Last I was in Constanza (March 2007) there was a weekly pick-up (4x4) leaving from the Gas-station at the entrance on Wednesday mornings (7 am. if I recall) - and possibly also on Fridays. Otherwise you'd have to track back down the mountain to Vega (regularly ploughed by guaguas or pickups in about 1 1/2 hours), and from there via SD, Bani and Cruze de Ocoa
cheers
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