If you own Keen type hiking sandals, they are the best for rainy park days. Great support, and I pair with smart wool socks - they dry fast, no blisters! Or a friend wore her aqua aerobics Rykas, again, good support, drain- made for water!. If you must wear sneakers, bring extra socks in a ziplock in your park bag and change often. Wet socks= blisters. Or they have thise satin liners hikers wear with their socks that help with the wet blister situation. Also bring an extra pair of shoes, so one can be drying and you can alternate. Stuff with newspaper to help dry and make use of your hairdryer.