Thank you all for the inputs.
I am traveling with a 4 year old kid, I feel he walks quite a bit for a 4 year old. So that should not be a problem am hoping.
I am reaching Rome only by 10 AM on the 25th so I cannot reach in time for the morning tours. At present, I see a 2PM slot for the guided tour which suits me.
If I book only the Vatican museum and Sistine Chapel tour won't I be allowed to use that connecting passage to the Basilica? And if I only take the audio guide, am I not allowed to go through the passage?
Connecting passage is important for us because am pretty certain my kid will not be okay walking all the way back to the Basilica after a tiring walk inside the museums.
I am leaning towards the audio guide as we also like to do things at our own pace but am worried about the "no entry" at the passage. Is there a way we can still sneak in? ;)