My wife and I booked a Sapa tour with TrekkingSapa.com. They usually provide some excellent english-speaking guides.
The trek itself is about 6 hours, and shows you a slice of life around in the mountain villages (belonging to the many ethnic groups). Many other local women folk (speaking impreccable english, french, german etc) walk alongside you, sometimes with their babies on their backs. If you chat with them, kindly buy some trinkets from her at the end of the trek. There’s a stop for lunch in one of the villages. The trek through the valley was a highlight of my entire trip through vietnam; I HIGHLY recommend TrekkingSapa.com!
ZOE BURRELL