Games for long trips

So to get to Germany next week i'll be getting a train, and then a plane. So i'll need something to occupy my time with. I'll be bringing my 3DS, DS and PSP so if any of you know any great games i could bring with me then please let me know. I'm already thinking of replaying The World Ends With You, but i haven't touched my DS in ages so haven't got any up to date games on there.

Nintendo

So i thought Nintendo's conference was pretty good. I liked all the new games for the 3DS, as really there are no games out for it currently. None worth buying or playing anyway.
During their conference they talked about a new Mario Kart, Mario, Kid Icarus, Luigi's Mansion 2, Star Fox, Zelda OoT and Zelda Four swords. I'm going to need to start saving up for all of these. Especially the new Smash Brothers they quickly spoke about.
And then the newly named Wii U was given a few titles, really the only ones i'm looking forward to are Assassin's Creed and Darksiders 2. But i'm sure many of you out there will be gleaming over Tekken, Ninja Gaiden 3, Batman, Dirt, Metro, Alien and that Ghost Recon which pretty much snuck into every conference.
And even though it wasn't shown here is the Wii U, however this is not it's confirmed final design.