I have a really neat water-bottle holder, with a shoulder strap and, when there's a bottle in it, an almost invisible zippered compartment and a loop I can hang my sunglasses from. I typically tuck my driver's license, one credit card, and a little local currency if I have it, in the compartment. I don't usually bother with a camera, but when I do there's also enough room in the compartment to tuck some extra batteries. With that, and a hat, I'm good to go.