"Mickey's Dog" is a favourite for us (Like the ministers cat only has to be vaguely disney themed and a dog because you can do Pluto for P) - going through the alphabet describing mickeys dog - so Mickeys dog is an animated dog, Mickeys dog is a barnstorming dog etc.
DD got into playing "what am I", where you ask yes/no questions to guess the answer she was thinking of. It passed hours on the plane, in lines, on the way home. Now DH and I can't stand it - I think we overid that one!
Otherwise, talking, hanging out, planning... and DH has his IPhone.