I always carry a small sketchbook with me where ever I go but when I am on holiday I take a sketchbook normally a landscape A4 size with me.
I usually make a clasp (usually made from twisted paper from the handles of paper bags) and collect something to close the sketchbook on holiday. You can see different clasps on the front of the sketchbooks.
I collect anything and everything that seems relevant to my holiday. Lots of tickets,postcards,litter,bags and of course photographs. My Photographs are digital and instant. the instant ones keep me on track with locations and feelings.
Here are some of my holiday sketchbooks:
See more Sketchbook page from my India Sketchbook HERE