The signpost in front of you points the way around the Castle's grounds.


Castle Courtyard
Town Square
Temple Quarter
Caravan Quarter
Knights' Barracks
Castle Keep
Castle Dungeon

There is also a small note attached to the sign reminding you that only Royal Guards may enter the Keep, only Hylian Knights can enter the Barracks, and only members of the Goro-Goro Cartel can enter the Caravan Quarter.