"A full day along the valley rim, from one hill viewpoint to the other"
Nagarkot to Dhulikhel Trek, Nagarkot Overview
This is the long one: six to seven hours south along the valley rim, past Nala and Banepa, finishing at Dhulikhel on the other side. The Himalaya stay in view for most of it when the weather allows, and the walking is mostly gentle ridge rather than climbing. You will want to stay the night at the far end rather than turn around, which is what separates it from everything else on this list.
