If you're going to be out in the sun all day, sunscreen is your friend. However, warm, slimy, and runny sunscreen is a very unpleasant friend. Protect your skin and make putting on sunscreen more comfortable by keeping it in an esky or cooler bag.
This tip comes from the Be It Ever So Humble blog, where Mrs. Mordecai writes:
I put the sunscreen in an insulated lunchbox and kept an ice pack in the top when we were away from home. Not only has the sunscreen remained effective through the summer (we have had NO sunburns this summer, hooray!), it has been much nicer to put on. I hate putting on warm, oily, slimy sunscreen.
As a bonus, the sunscreen is always corralled in one place now, and it's easy to grab if we want to take it with us.
Keeping sunscreen in the fridge at home is a familiar tactic for some of us, and this is a sensible extension.