Some people would like to travel with equipment that could be useful and resourceful. When I travel I usually take only 2 specific types of equipment that are light to carry but effective regardless of where you are. That would be the Chest Expander & the TNT Cables, they have been lifesavers for me as they give me the type of training I'd like to do that can be done just as in the gym. Hook the door attachment to a door, strap the cables in and you're good to go. Basic exercises like Pulls, Presses & Squats can be done with the cables. The Chest Expander is just as awesome if not more convenient and has nearly as many exercises to choose from.
When it comes to specific workouts while traveling, hands down Circuits. Doing these for 20 minutes is all you need to get in good shape. The Darebee Workouts work best for training in hotel rooms, waiting for a plane or wherever. I once did a workout that involved stretching & Bridging exercises while waiting for a plane at the airport. I'd rather do a circuit in a hotel room or outside somewhere where i'm staying so I don't sweat all over the place. When it comes to equipment, resistance bands are best and to me Lifeline Fitness carries the best kind and very affordable. Do workouts that are within the 15-20 min range or less unless you're on vacation and may have more time you don't need to train any longer than that. When I'm in Lake Tahoe, I take advantage of my surroundings and head down to the lake to lift heavy rocks, swim, crawl amongst the rocks, climb ladders of the docks and anything else that suits my imagination.
I get it some like to use a gym and maybe some may need it like Pro athletes or musicians, entertainers or whatever but for the most part unless you're a bodybuilder, powerlifter, strongman you don't need to go to a gym while you travel. Have some imagination. If you got a good small amount of space; you can do some crazy training. Since me and my girl are heading to Disneyland for her first trip to California we'll be walking the majority of the time but in the hotel, mostly calisthenics & resistance training will be used but at the parks in line for rides; Isometrics baby. Push, Pull, Wall Sit, Squeeze & flex in various positions as you stand in line. Be open minded and be resourceful with what you have. Use the environment and use your imagination and you'll never ever need the gym again. Value what you have and make use of your surroundings. Don't make excuses to not train.