>>1391461>>1391466There is an entire district of Kathmandu dedicated to tourism, mostly trekking and mountaineering - Tamel. A lot of hostels, hotels, outdoors equipment - both proper expensive stuff, as well as bootleg stuff with production on the spot.
There are also a lot of these small agencies that offer to organize trips to various places, rent transpot, get guides, etc.
I've been there a couple of years ago when I went to Annapurna circuit, really interesting place, but it's getting really expensive due to tourists from western countries. Street vendors would try selling me fruit for more than it was worth in my northern european country.
Also, a lot of offers to buy drugs. Don't do that unless you know what you are buying.