If it has been booked with Disney then I you should be able to have the shoot inside the park, though *I think* it depends on what your in laws booked.
I seem to recall that an in park shoot may be more expensive than a resort shoot, I've not had one of these myself though so I could be compeltely wrong.
It may be worth asking your in laws for more information or speaking to DPS:
http://www.disneyeventphotography.com/weddings/honeymoons.php