One of our gift ideas for our 10 year old is a pen to write secret messages, you can view them when you shine the light on them. Along with that he is getting a decoder ring and a book for writing secret messages.
http://www.amazon.com/gp/product/B00JIUJJ1E/ref=ox_sc_act_title_2?ie=UTF8&psc=1&smid=A140XH5HZA5NY(ring)
http://www.amazon.com/gp/product/B00J3BKCIM?psc=1&redirect=true&ref_=oh_aui_detailpage_o03_s00(pen)
http://www.amazon.com/gp/product/0763629723?psc=1&redirect=true&ref_=oh_aui_detailpage_o04_s00(book)
Mad libs are another idea, I have a 12 year old that likes those to. I ordered the spy, ninja, and the worst case survival handbook mad lib.
Both by sons asked for watches. My older son is a runner so he is getting a running watch.
Hope you end up with some good ideas