Dont know bout you but i'll be using friday and sat to wander GA like crazy!
I've been there a few times. My plan on Friday is this:
Start at the grandstand at Serraglio, right after Lesmo 2, in time for first practise at 10. It is cool to sit here and hear the cars leaving the pits heading towards first chicane. You can hear them all the way until you see them leaving Lesmo 2.
Sit here a few minutes and walk towards Ascari. Wait for the cars after the tunnel. Take care, the engine noise is loud!
Walk further down and stand by the fence where the braking starts.
Sit the rest of the session at the grandstands at Ascari.
Start the second session at the grandstand at the second chicane. Walk towards the Lesmo turns, or towards Curva grande. Try grandstand 6c, b and a to see who is best.
I have been to Parabolica, but I did not find that grandstand interresting.
You have all Saturday and Sunday at the first chicane, grandstand 6b.