Some special treks of nepal :
1. Annapurna base camp trek for 12 days.
2. Langtang gosaikunda trek for 12 days.
3. Everest base camp trek for 12 days.
Some famous short treks :
1. Poon hill trek for 5 days and two days for pokhara total seven days.
2. Langtang trek for 8 days.
3. Helambhu trek for 8 days.
Most of the people like to go trekking for one week and afterwards, visit chitwan national park for around 2 nights and 3 days to see the wild animals like rhinose, tigers and many more kinds of animals.
Tourists love to do sightseeing as well in Kathmandu, Bhaktapur and Patan Durban square .
Bhaktapur is on the list of the Unesco world heritages and really beautiful.
I recommend to stay two weeks in total in Nepal to enjoy our wonderful country. During the trek in Nepal trekkers will sleep in hostels every night.