We were just on it yesterday. We'd never sat in the very back before and wow you get one heck of a ride back there. But hey, my 2 1/2 year old dd FELL ASLEEP!!!! She had put her legs up on the seat and I was holding on to her because we were really bouncing around and I felt her head getting heavier and heavier and she was out like a light by the time it was over.
Anyway though, to answer your question, she usually LOVES the safari ride and seeing the animals and I'm sure your 2 year old will too. But if they don't like a really really bumpy ride, sit in the front!