well, i would probably go on an adventure for the few minutes i would survive before being attacked by the local enemies. If i could, i would try to form an alliance (or agreement) with the protagonists and try to convince them to let me stay in their city; since I'm human, i would have no awesome powers like they would. And i would enjoy the time i pend there while trying to think of a way to get back home.
If this is the kind of "you are suddenly in this game" where you turn into one of the characters (or even someone the same race as the characters) then i would probably stay there... forever.