There is a lot to look forward to in the setting of an action book. I like settings where characters are already struggling to survive. In a fire, for example. There would be a lot of tension with any action in this setting. Any action in this setting would give a further threat to some hard times. In this type of a setting the reader does not know what to expect. Another example would be a famine area. I like settings to take place in these areas. The main character does not necessarily have to be there. I just like how it feeds the imagination. You ask yourself, "How are they going to survive?"