From the car park in the courtyard between Cambridge University Press and DAMTP there are two entrances to DAMTP.
The door on the west side of the courtyard is the main entrance to DAMTP. Here you will find the reception office. If you turn right twice while staying on the ground floor, you will find the Common Room at the end of the corridor.
The double blue doors on the south side bring you into the Syndics
building, where you will find the Syndics Lecture Room on the
ground floor, and the offices of the Fluid Dynamics Laboratory
on the first floor.