Visitors pick grapes during their visit to Qingquan Lake, a rural destination in Guanxian county, Shandong province, during the May Day holiday. During the recent May Day holiday, Qingquan Lake, a picturesque rural destination in Guanxian County, Liaocheng city of Shandong province, saw a remarkable influx of over 60,000 travelers, thanks to the introduction of a captivating night tour at …