Nepal has some of the best trekking in the world and several of the world’s highest mountains, including Mount Everest. Many people visit the country just to trek and the tourism industry is well prepared to facilitate all types of trekking styles and destinations. On the one hand, you could spend a year planning an expedition to wild and lofty places; on the other, you could land in Kathmandu with no plans and be on the trail to Everest Base Camp (EBC) in a matter of days.
Only TAAN registered trekking agencies in Kathmandu and Pokhara can legally organize treks and provide the services of a guide and/or porter with insurance. Be aware that no one else, no hotel, no street broker, no nice person you just met, not even a trekking guide is legally authorized to organize a trek. During the main seasons, the agencies run regular group treks, both tea-house, and camping styles, and it is generally possible to join a group doing a trek of your choice. Independent trekking is quite easy in the main trekking areas.
Required Permits a trekking permit issued by the Department of Immigration is required to trek in any part of Nepal, except the most popular areas of Annapurna, Khumbu, and Langtang/Helambu. Those areas were declared permit-free in 1999. The joy was short-lived, though, as a new system called TIMS (Trekker Information Management System) was recently created for those three areas. Be sure you have a TIMS card with you when trekking independently or organized. Individual TIMS is obtainable only from Nepal Tourism Board offices and the Trekking Agents Association of Nepal office. Not even Trekking Agents are legally authorized to obtain individual TIMS (even do many small Trekking Agents will offer the individual TIMS). Police checkpoints and Park officers can at any time check your permits.