From 4 p.m. to sunset, Splash Island Waterpark at Palmetto Islands County Park in Mount Pleasant will host its very first Yappy Hour. Beverages will be available to the owners while the dogs have their own fun splashing around the park. Advance admission is available at CharlestonCountyParks.com for $8; on-site admission, if available, will be $10 per dog. Dogs must be up-to-date on all necessary vaccinations to enter the event. To maximize canine fun, owners will not be allowed to…