Is the Operational Plan that bad ... or just needs fine tuning
because ..like Patsy said I'm sure they'll ask your opinion (was that the sneaky reason they gave it to you in the first place?) when they know how much experience you have with them!!!
As to the insurance - I would just check in passing (so to speak) as the whether your groups policy is upto date...as I'm sure pre school's public liability usually covers volunteers/students and other visitors who aren't employed by them!
signing in & out ... lol.. you know the right thing to do
!!
(Oooh - do they have a signing in book
!?)