Play, stroll, hike, or picnic at any Charleston County park…for free! Charleston County Park and Recreation Commission celebrates their Customer Appreciation Day by offering complimentary admission to James Island County Park, Mount Pleasant Palmetto Islands County Park, North Charleston Wannamaker County Park, Isle of Palms County Park, and Mount Pleasant Pier, among others. Locations vary. Sunday, dawn to dusk. Free. (843)795-4386, www.ccprc.com