We did the Langtang Valley 5 day trek with 4 people in October. The overall trip is an incredible adventure in nature and culture. The airport was very chaotic and there is zero concept of personal space, so heads up. We started out in Kathmandu and we were very well taken care of by our outfitter and guide upon arrival. They picked us up and took us directly to the hotel which had decent amenities and an awesome restaurant, french bakery, and bar adjacent.
We had a group of 4 people with drastically varying ability, experience, and apetite for adventure. Our guide Bibek did an awesome job accommodating everyone's needs, desires, and pace. He couldn't have been more patient, positive, supportive, or pleasant to be around. He kept us laughing the whole time and learning about the local history and culture from him was well worth the price.
We were fortunate enough to take a Jeep to Syabrubesi rather than a bus, which I would highly recommend. It's an 8+ hour drive and it gets bumpy. Like, riding a bull with a plywood saddle bumpy. If you want incredible views and don't have a fear of tumbling down steep mountain cliffs, sit on the left on the way there, and the right on the return. If you don't, sit in the middle or on the opposite side. While the ride is rough, it's non-stop stunning views of the expansive mountainous landscape.
As for the trek itself, it was an experience of a lifetime. It was among the more physically challenging things I've done and I'm a very fit and active person. If you have any aches or minor injuries this trek will definitely make them abundantly apparent. Every turn and step forward brings a more splendorous view than the last. The trails are "Nepali flat" which means you can expect to cover over 3000' and 10 miles of rough terrain your first couple of days. I injured my knee hiking the Adirondacks in February and that old injury flared up very intensely on the way back down, so pack a brace or carry a trekking pole for backup if you have any known issues.
The locals and fellow trekkers could not have been more friendly. The food was surprisingly good and you can readily find some of your favorite guilty pleasures (like coke, snickers, or pringles) in even the most remote lodges. The lodges were pretty basic, but very cozy. Sitting around the wood burning stove drinking hot tea and talking with everyone is the perfect way to end the day. Some lodges have solar showers and western toilets, some don't.
This is hands down one of the most beautiful places I've been on earth. It's constant views of waterfalls, beautiful skies, massive boulders, dense foliage, vast mountain ranges, glaciers, and the constant sound of raging river rapids. We got ample opportunities to see monkeys, yaks, and donkeys. Dense clouds obscured views of the snow capped mountains the first few days, so plan to stay at Kenjing Gompa a few days if you can spare the time so you have a window for good weather and views.
Pack light, but pack for every climate. We went from hot humid jungle to below freezing over a three day period. I packed shorts, pants, synthetic T, long sleeved synthetic, windbreaker, down jacket, hat, beanie and I wore them all.
What are you waiting for? Book the trip already! This is a trip you're going to remember for the rest of your life and an opportunity to make new friends from all over the world.