Eyepiece and accessory recommendations for Celestron Nexstar 6SE?

Hi all.. I (or maybe Santa?) got our son a Nexstar 6SE for Christmas. We are in Oregon and are flying to Connecticut for Christmas. I'd like our son to have something to open, and I don't think the telescope is going to fit in the overhead bin. Does anyone have any recommendations for eyepieces, filters, and other accessories that I could wrap up and give him with a picture of the telescope?
Thanks!
Mike