There are a number of different activities to do while in Tanzania that don't involve animals. One of my favorites is visiting local tribes. Not only do you get to see how others live, you have the ability to directly inject money into their albeit small economy which in turn allows them to continue living traditionally. It's a win-win for visitors and for tribesmen alike.
Below are pictures of three different tribes I visited during my latest trip, including the Hadzabe tribe that allows tourists to go hunting and collect wild honey with them. It is an incredible experience, one that should not be missed.