I personally wouldn't sweat it with being only away for a week. I know they make practice fret boards but I don't have any experience with them. An interesting mental exercise is to imagine yourself fretting chords and moving your fingers into the approximate chord shapes. I seem to remember reading that there is some benefit to such activities.

ETA: If you have internet access you could focus on the music theory lessons in GT (one of the instructors can probably point you to such lessons.)