Traveling can throw a wrench into your workout. Most of the gyms in hotels are sub par and limited in equipment. That doesn't mean you cant have a decent workout. Even the crappiest of hotel gyms will have at least one treadmill.
Here's a few things you can do even in the most minimal of hotel gyms:
Chair Dips - If your hotel's gym is complete garbage, most likely it will not have any free weights or a flat bench. If this is the case use the chair in your room and perform chair dips
Flat bench dips - If the gym is equipped with a flat bench, skip the chair and perform standard flat bench dips.
Standard push up - You know how to do it
Decline push up - Target your upper chest with a decline push up. Use the flat bench or the ball.
HIIT - 30 on and 30 off.
What? The hotel tread mill is a piece of shit? Well, use the stairs.