Im sorry but Kings Dominion is SO GHETTO.....Dirty, Metal detectors, rough crowd. I'd avoid it.
Hershey is a great park probably a top 5 NON DISNEY park. Bush Gardens Williamsburg is the most beautiful park in the country (Nicer than Disney) as it is biuld in lush woods over a ravine.
Hershey has 3 wood coasters (one a racer), an inverted, a great launched coaster, a coaster where you have a water war as you ride with the people in line, a few great water rides, a boomerang and a entertaining 3d movie. Your kids will love it. Plus the Superdooperlooper, no matter what anyone says a great starter coaster for kids and still one heck of a fun ride
Darien lake is a mid sized park that would be entertaining if you havent been there. But it is no Hershey