In my experience, going on holiday and painting just don't mix. One can become very engrossed in a subject which can make others feel (understandably) excluded and ignored. So, a small cartridge pad, a few ink drawing pens and about 15 minutes while they search for ice cream and just dive in!!
I really enjoy doing ink sketches from life with no preliminary pencil drawing. When I first started it scared me, no way of rectifying...... What if I mess it up? Well, it's a bit of paper, that's all!!