Facewipes
Not only do I love these Dermalogica PreCleanse Wipes ($29) for removing my party eyes at the end of a long night out in London town, I also think they're awesome for swiping off the sunscreen, salt water and feeling generally refreshed when the Spanish sun is just too much. They come in a neat pack of 20 - just remember to keep them sealed to remain moist and effective.
A balm
There are two clever multi-purpose products I really love - Everything balm from Trilogy ($24.90 for a traveller's 45ml size) and Go-To's Execeptionoil ($54.95). Both of these moisturise, protect and heal so they can be used to ease chapped lips, soothe sunburn, reduce raging rashes and even flatten fly-aways. A balm will come in so handy, you'll be glad you brought one and so will your new travelling pals when they need to borrow some.