I'm go to LA to see family, so I'll be limited to Vita and 3DS. Dat 13 hour flight though.
I haven't quite decided what will be my focus, but I'm leaning towards replaying the first three MGS games.
Other options are Pokemon Alpha Sapphire if I'm not done by then and perhaps a JRPG; either an FF, DQ, Chrono Trigger or Mother. I'll probably just replay FFX since I've hardly touched the Vita version.