don't do anything to do with politics, their courses are rubbish in 1st and 2nd year. do anthropology, its immensely popular as an outside for a reason.
course reviewer on the eusa.ed.ac.uk union website is a great resource.
oh yeah, don't trust timetab, sometimes it goes weird (i think the reg feed it crack), just go on drps.ed.ac.uk , find the courses you plan to take and write down the lecture times. i know it's a bit primitive but it's better than timetab!