positioning can be key in certain situations.
As for charge?
You can take a move action, and all the limitations of hindering terrain and hostile figures applies.
Or you can charge without an attack, moving spaces and ignoring any speed restrictions.
The action "may" contain an attack. If you take the action and attack, then it is an action that has an attack.
If you take the action and do not attack, then it is an action that does not have an attack.