That's what this $14 hide & seek board bought me. Which, if you've ever flown with a 1-1/2 year old, you know is worth every penny. Each door opens to show a magnetic animal or object that can be removed. We didn't even lose any of the pieces!
Another hit was the sticker book her brother had just finished doing (Usborne's Wooly Stops the Train). She spent fifteen minutes carefully peeling the stickers off and sticking them on the window and all over me.
The magnet board is by Melissa & Doug -- I purchased it from Amazon.