As is mentioned in other threads, the rotunda by the threshold to RWY 03 is one of the better spots from 1100 on. It's the rotunda at the top of this map: http://maps.google.ca/maps?hl=en&ie=...6161&spn=0.009436,0.01929&t=h&z=16
It's fairly easy to get to both by car and by bus (looks like routes 17 and 206...) If you're driving, there's parking right on the rotunda (unless they've changed that in the last year), and the road is high enough that the fence doesn't get in your way. This was the only spot I used when I was there last year, it was quite popular too.
I don't know about the other spots that Luis G. mentions, but I've seen some good pics from those areas too.