 Many state parks across Connecticut were forced to stop accepting visitors after reaching full capacity yesterday as the Fourth of July weekend wound down. Warm temperatures sent thousands into state parks, especially those that have swimming areas. Squan's Pond in New Fairfield was the first to close, reaching capacity just after 9 yesterday morning, about an hour after the park opened. Others forced to stop welcoming people included Rocky Neck State Park in East Lyme and the Coventry State Boat Launch.