Hello again

I'm sure you will get plenty of answers from the Ca'ers. What sort of freedom are you looking for? Do you mean where can you roam? Or something else?
Roaming wise, all the public areas, which excludes behind the pits but you do get a pit walkabout on Friday. The track from about Masion Blanche to Tertre Rouge, look on this web site for viewing areas and look in the help section for circuit maps. All of the historic pits during the week, including the tyre area, if you fancy a race tyre or wheel hang around here on Sunday about 17:00.
Obviously there are off circuit viewing areas at Arnage and Mulsanne, again look in the help section.
Grandstands are for grandstand tickets holders I'm afraid and there will be ACO staff checking tickets all through the race even at 02:00, not sure what it is like during practice on Wednesday and Thursday, you may have some luck then.
Not only will you find space for BSJ on Thursday, you could also by tickets for BSJ on Saturday for a mate if needs be.
Hard to say what the public area of the track will be like especially the Village as it has been torn down, but the atmosphere is just awesome so there will be plenty to do, have no worries.