There are several things that you can do when you go out of town. Body weight exercises are perfect for a hotel room. A jump rope is easy to pack and is great for cardio, especially if you can learn to do double unders.
Tabata workouts are a great travel workout. You can put a Tabata workout together in many different ways, and can even do one using a treadmill, rowing machine or pool (often found in your hotel gym). Tabata workouts are done doing each exercise for a total of 4 minutes, with a pattern of 20 seconds work and 10 seconds rest. For example, here is a 12 minute hotel workout:
Do pull ups for 20 seconds, rest 10 seconds, pull ups for 20 seconds, rest 10 seconds…and so on for the full 4 minutes before going on to Squats during the final 10 seconds of rest; continue this pattern for the squats for 4 minutes, then go on to sit ups.
A treadmill Tabata workout would be done similarly, while having the incline as high as it will go and running close to your 5K race pace (within 5-30 seconds).
Some other great Tabata exercises are:
hand stand push ups off the edge of the bed
dips using a chair or coffee table
Click HERE for a list of Travel WODs.