I'd definitely be packing some snacks - you will need them for the airplane trip anyway and a couple of muesli bars for you and DH won't take up much room.

Did you have books for DS?

I'd take the pram unless it's a real pain with the airlines. So handy to put stuff underneath, you and DH can go for a decent walk with DS in it (there's only so much lazing around I can handle, still need to be a bit active).