Lake Compounce Family Theme Park, which opens its doors on May 13 for its 160th season, has grown from the site of a failed electrical experiment into one of Connecticut's treasure troves, has survived the advent of theme parks continues its dramatic growth. Owned by Kennywood Entertainment of Pittsburgh, Penn., the park is home to the only wooden roller coaster built into the side of a mountain, there is free Pepsi, among other trademarks, and the park is rich in history.