Mototaxis are motor-tricycle taxis that are the standard mode of transportation for Pucallpa. Expect to pay about S/.2.00 for a trip within downtown, S/.3.00 for a trip in from the outskirts of town, and as much as S/.6.00 for a trip from one of the suburbs you might need to switch mototaxis. About S./4.00 to Yarinacocha.
Collectivos are normal passenger cars that run set routes like buses. They are a cheaper option for travel especially if you are alone - S/.1.00 per person. Note that the collectivos can get crowded - two people in the front seat and four across the back seat. Pucallpa to Yarinacocha is S./1.50.
On Foot:Downtown Pucallpa is small enough that you can get to many places just by walking. If you don't know where something is located, ask directions, but be aware that the directions you are given are not guaranteed to be correct. People feel compelled to give an informative answer, regardless of whether or not they know the right one.