I DID A SEARCH AND FOUND THIS MSG I'D POSTED IN THE PAST FOR A SIMILIAR QUESTION. HAVE A NICE VACATION!
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What about pushups? I'd be doing some serious pushups if I didn't have my weights. Heck, I do them anyhow!
Use lot of different positions for variety:
Hands at chest level with a wide grip or a shoulder width grip to hit the chest; consider these same variations on flat, level, and decline angles
If you sort of push up more and round your back at the very top of a push up, you get a little rear delt and upper back too. (This idea came from MTV's Total Body Workout with Keith Byard.)
Put your hands narrow, and low by your ribs, to hit your triceps.
And my favorite--hands a little bit out in front of you to make the front delts do the work. I actually do this on my step, facing the short side, with hands in a hammer position. (From Reebok Extreme Step.) But on the floor should work okay too.
Then, of course there are tricep dips and pull-ups (well, pull ups are rather difficult and still require something to pull up from.)
With your chord and your own body weight--and a little imagination--you can definately still get a great upper body workout.
Jeanne