The plan is to keep everything a surprise until we're on the plane and then to bring out activities one at a time. When I picked out games and activities I chose ones that are creative and can be used and played with in a variety of ways, by himself or together with us, so that hopefully he won't be bored a few minutes into it.
Sketchbook and Pencils
Drawing and coloring is fun for everyone, and this can keep Noah entertained for quite some time, especially if we engage with him and draw things together. I bought a high quality nice looking sketchbook that we've used before on a trip and added to our collection of colored pencils. I love the artwork on these sketchbooks and the paper is nice and thick. Our local book/crafts/toy store typically has only a few different options, but of course Amazon.com has a wide selection, including some for a great price: http://amzn.to/1U4g2StWe already have a good selection of pencils, but I liked the ones that came with the sketchbook and I think they'll make for a great surprise.