If I were you I would go to the Catskills, if you have not already. Then head to Watkins Glen for more camping, hiking, gorges/waterfalls, and a cute little town. I would then probably head to Letchworth. The views there are amazing. Then down 20A to Buffalo where you could see Delaware Park, shop on Elmwood and Allentown or head to Route 5 and go to one of the beaches on Lake Erie-stay away from Woodlawn as it costs money and is not as nice as Hamburg Beach or Wendt beach (in Derby). Then from here you can easily hop on the 90 and head to the border. I would also recommend stopping in Lewiston if you have the time or Old Fort Niagara.