To visit Nepal, a tourist visa is required. To get it, the easiest way is to make the request directly to the Kathmandu Tribhuvan airport. A photo ID is required.
There are two types of visa (tourist) payable at the Airport (tourist): Visa 15 days = $15, Visa 30 days = $40, Visa 90 days = $100. It is also possible to renew once on-site at the Department of Immigration (to Kathmandu or Pokhara) up to a maximum of 150 days per calendar year (1 January to 31 December).
Alternatively, you can make a request prior to your arrival at the Nepal Consulate in your home country. If you arrive by land (from India, for example), it will be possible to obtain a visa at the border with the Nepali immigration office.
Before deciding which trek you will do, it is worth questioning whether you have the physical capacity to go trekking in the mountains.
The trek will require only a normal level of fitness. After all, walking is within the reach of all. There is little technical difficulty. You usually walk around 6 hours per day.
Because of the high-altitude, a little preparation (as a precaution) is recommended. In fact, if you do not have the habit of making sport, it may be preferable, before leaving to do some hiking a few hours, to learn how to listen to your body and find your own pace.
If you are older than 45, a medical examination with your physician is recommended for trekking at high altitude.
No single trek in the Himalayas is the same. Each has its different character, culture, landscape and challenge. Choosing carefully beforehand will make sure you are doing the trek you really want to do. Think about what you want to see, how much of a physical challenge you want, which cultures you are interested in exploring, if you want more nature or to visit temples and see the life in the towns and villages.
Some treks journey mostly through arid land, some through pine forests, some almost entirely above the snowline – and some featuring all three. Some areas in the Himalayas are more Tibetan in their cultural influence, some more Nepali. Some treks have many many guesthouses and restaurants along them, some have very few and feature more homestays and simple kitchens. Think about your comfort level and how ‘touristy’ you want your trek to be.
You must take into account the altitude your trek goes up to. Although some treks are considered fairly easy (Annapurna, Tamang Heritage Trail, Kathmandu Valley), there are still significant enough altitude and passes that may be a challenge. Beyond 3000 meters of altitude, the body must make an effort to acclimatize to a decrease in the amount of oxygen absorbed by the body with each breath. Again, I am more than happy to discuss your requirements and capabilities in more detail.