Great question — answering as the UphillTech team:
One possibility is the trek to Gosaikund - also known as the "Frozen Lakes". It can be done in six days walking. However, I'm not sure I would call it easy- the first day, especially, will be very strenuous. However, it's a very pretty trek, and the first two days are very rewarding. Another advantage is that it's relatively close to Kathmandu, which means less traveling to get to the trail head. Like the other popular treks in Nepal, it's a "tea house" trek - you don't need to cook or take a tent, which means you can travel light. When I was there (late 2006) many of the guesthouses were already equipped with solar showers, too. The description I linked to above combines the trip to...
Full answer by Eyal: https://outdoors.stackexchange.com/a/1659 (CC BY-SA 3.0).
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