A map showing the key places can be found here. Walking directions are provided on the left hand side menu (click to display). Note that the map gives directions to the rear entrance of the Mathematical Institute; there is an entrance on St.Giles which is more convenient.
The conference accommodation building, the William R Miller building, is located on Dawson street. It is clearly labelled with a St. Edmund Hall crest above the entrance, and is the only building with an entrance on Dawson street.