Visas
Citizens of the UK, the US, Canada, Australia, and most countries in the EU, need a tourist visa to enter Tanzania. Application details and forms can be found on Tanzanian Embassy web sites. Tanzanian embassies issue single ($50) and double ($100) entry visas (handy if you’re planning to cross over to Kenya or Malawi for a few days). They do not issue visas for more than two entries.
Tanzanian tourist visas are valid for 6 months from the date of issue. So while planning ahead for visas is a good thing, make sure the visa is still valid for the length of time you plan to travel in Tanzania.
You can obtain a visa at all airports in Tanzania as well as at the border crossings, but it is advised to get a visa beforehand. In order to get a visa you have to have proof that you plan to leave Tanzania within 3 months of your arrival.