As well as US dollars, other convertible currencies like the euro, Pound sterling and Australian dollars can also be used but some smaller entry points (like Birgunj) may not accept them.
All tourist visas are currently "multiple entry" type visa and permit multiple entries and exits during the period of validity.
Be aware that without permission voluntary services while on a tourist visa is strictly prohibited. It will be a punishable offence.
There is detailed information on the official website of Nepal Immigration, where you can download the appropriate forms.
Kathmandu
