The Langtang region next to the Tibetan border is not as popular as the Annapurna and Everest trails, and that's one reason why we like it. The region has many things going for it: it’s fairly close to Kathmandu, there’s a wide range of stunning scenery, you get right into the high mountains within a couple of days, and there are lots of possible trek combinations.
For high mountain pastures, peak climbing and glacier views, the Langtang Valley trek is hard to beat. High in the mountains further south are the dozen or so holy mountain lakes of the Gosainkund region, which offers the region's best mountain panoramas as well as fine lakeshore views. From the lakes you can continue over a pass down the Helambu ridge all the way to Kathmandu. For more of a cultural look at village life consider the homestays and lodges of the Tamang Heritage Trail.