, I know 2. 1 is only reachable by car (I don't know it you have one), the other one I don't know if it is still there, but I'll try to explain it to you anyway.
While in the terminal, walk towards the CSA checkin, walk outside and continue walking towards the freight area. When you are on the other side of the freight building (and tired) turn left. There is a fence wich is next to the cargoplatform, keep walking until you are in the corner. You now have a view on the taxiway, and landing aircrafts.
Note: for this spot 2 things are important, a small ladder (around 2-3 steps) and the wind blowing in the right direction.
For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and ther