incline pushups (feet on bed)
jumping jacks, running in place
squat thrusts or burpees
hindu squats till your quads cry
situps or crunches
dips between two chairs or chair/bed
curls with a kitchen chair
pullups or chins, if you can find a good place, without ripping the moldings off the doorway
most of these will focus more on getting to fatigiue through reps and intensity, not moving a lot of weight, unless you weigh 400 lbs already. Not a huge size gainer workout, but enough to keep you "in the game" without vegging out for a week. I'll bet you will make some new sore places that your regular workout doesn't reach.
I just got back froma week in the Caribbean eating like a hog. I got in one bodyweight worhoput in the room, can't wait to hit the pile tonight.