The nearest MTR stop to NAIS is Lam Tin. The easiest way to walk there is to take Exit A and follow the signs to "Laguna City". Then follow the sign to "Kai Tin Shopping Centre". After taking a few escalators going upwards and then walking through the malls, you will come out onto On Tin Street. Cross the road and walk up on Ping Tin Street. Walk up to the top and you will see St Paul's Secondary School (a red and white building). NAIS is right across the road. Simple!