Hi Miaka! Resistance bands can give you a great workout while you're on the road.
I have clients who travel with four of them (yellow, green, red and blue) and can do full body workouts wherever they find themselves.
Here's the workout that I put together for my clients - it covers all body parts except for abs. Those you can do with a million kind of crunches and no resistance at all.
Legs (blue band)
Squats
Lunges
Inner and outer thighs, butt kicks (band under a table leg)
Single-leg leg press / leg lift combo (lying down)
Chest (red band around a pole or doorknob)
Chest press
Pec flyes
Back (red band around a pole or doorknob)
Back row
Shoulders (yellow band)
Front raises
Side raises
Overhead press
Arms (green band)
Curls
Hammer curls
One-arm overhead extension
I bought my bands online at
http://www.bodytrends.com/products/resistance/index.htm . It would be hard for me to write up descriptions of the exercises if you're not familiar with them (I spend an hour teaching this workout to clients) but there are books and videos available that might be helpful and you might be able to find illustrations on the Internet.
Good luck! I think bands are perfect for traveling!