Lots of good suggestions for toys, but one thing someone on here suggested that really entertained my DDs is an old wallet with random crap in it. I cut out pictures of babies and mommies, and hid them in the little slots. Old hotel room key-cards, old airline frequent flyer cards, random pieces of pretty ribbon, pictures of dogs. They really liked it. Heck, when I'm flying I'd slip $100 in there if I thought it would keep them entertained! If you have an ipone or itouch, now's the time to download stuff for them.