Define what is long, and what devices you'll be bringing. Gaming-worthy laptop? Buy Kerbal Space Program. Only Android/iOS devices? Download the Kindle app and peruse the free e-books - there's a lot of good ones. Also, obviously, the Dark Side of the Moon album of Pink Floyd. I heard Fallout:Shelter was a good Android game. And if you're not above downloading movies (reminder: downloading music, in most places, is just as bad an offence if you haven't bought it), there's the whole Marvel Cinematic Universe that is amazing. And if you like/are open to anime, there's quite a few to try out - Paprika, Paranoia Agent, Children who chased lost voices, Patema Inverted, anything by Hayao Miyazaki, Summer Wars, The Girl Who Leapt Through Time.
Yeah. It gets more fun when you put people down on planets. The dV cost to extract Kerbals from a gravity well is ENORMOUS.