I did an activity last week, where I gave the students a starting point in the school and a sheet of directions. They had to follow the directions to find certain rooms in the school and then write down the classroom number.
I won't post the directions as every school is different but the key expressions we used were:
go straight, left, right, first left/right, go up the stairs etc.
A few students struggled but for the most part they did very well and got correct answers.