While travelling I have: scratchbuilt several large wooden buildings (including two snowsheds), assembled wooden kits, assembled repetitive small assemblies for larger structures like bridges, painted and weathered metal vehicles, written articles for the model press, written JMRI signal control logic , etc. I am currently gathering materials to scratchbuild a metal clad sawmill while we are away back east this summer. In most cases I get up 2-3 hours before the rest of the family to take advantage of the "quiet" time!
I always strive to ensure any hotel has an area where I can work without disturbing them.
I pack cutting surfaces, hobby knives, glues, paints, small tools and lots of materials...these are all packed in a sealed cardboard box and then placed in checked luggage.
Vacation time can be a very productive time!
md