New rental building, what can I do?

Just moved into a brand new rental building this past weekend and I am trying to figure out exactly what can be done within the apartment that won't count as being some sort of damage. For example, there are no hooks on the bathroom door (or on the back of any door), and there isn't any place to hang anything on the walls either. Nothing was spelled out in our lease except for there being a rider that we weren't allowed to paint the unit (which is stupid if you ask me, considering all they used was that cheapo flat paint the contractor sprays on). Is there any real rule of thumb when it comes to this stuff? It has been a non-issue in every place I have lived in prior.