I like to make sure I bring all the little things that can be expensive if you have to buy them at the parks. Bandaids, aspirin, liquid painkiller for little kids, waterless hand sanitizer (you never know when you might touch something gross), elastic bands for your hair or to bundle up park maps and things, small scissors in case someone tears a fingernail or you need to cut tags off a T-shirt so you can wear it, etc., etc. It gives me a great feeling of security to know I can easily handle these small emergencies.
Teresa