PITTSTON — Paul Cooper might be a bit sad that Cooper’s on the Waterfront will no longer be a full-service restaurant, but he is looking to the future with enthusiasm. The business, co-owned by Paul and Jack Cooper, opened its doors in Pittston in 1991. The restaurant eventually expanded to include Cooper’s Cabana and a forest room with a view of the Susquehanna River. It will now grace the banks of the river as “Cooper’s Catering and Banquet Facility.” Still, Cooper said, the business’s customer-based focus will continue. “When people come into our restaurant, they’ve been able to enjoy a meal, a drink, the view of the river,” he said.