They make portable chin up and dip contraptions. The one pictured ratchets to a tree. Also pick up the book Never gymless. It's a good read. Not a fan of the rubber band rage. The resistance is nearly non existent for half of the rep then it gets too hard. Try something like this while traveling.
1. Split jumps from the lunge position (Power)
2. Burpees (conditioning)
3. Deep controlled body weight squats.(legs)
4. body weight lunges (legs)
5. Pull ups ( back biceps)
6. Body weight rows from a low bar. (back biceps)
7. dips (chest and tricep)
8. Push ups elevated feet (chest, delts and triceps)
9. Regular push ups (chest and triceps)
10. various ab work like situps, crunches and leg raises)
11. single leg calf work
Throw in some distance or sprinting alternated with the bodyweight strength training days.
Never think you're at a disadvantage with body weight stuff. You could be ripped and in fantastic condition doing it.
Someone mentioned TRX. Truly a portable system.