Go rent a bike and drive up the road to the Silver Waterfall and Tram-Ton-Pass. Sapa Panorama hotel does
offer Specialized, Giant, ... mountainbikes. Pretty decent quality and only $12. Trekking is supposed to be great to - didnt get to it unfortunately, but the bus ride from Lao Cai through paddy field areas was very nice. I wasnt that "bothered" by the locals, as I mostly ignored all those people trying to start a conversation. Worked for me, so not that much hassle.
Restauranttipp: "Little Italia" Cau May 14, Sapa (superfreundliche Bedienung, super grosse Auswahl an
Essen und super fein! Terrasse oberhalb des Restaurants mit Blick auf Altstadt)