Grand River Conservation Authority says several of its parks saw “significant challenges” on the weekend with visitors not following rules and restrictions put in place amid the novel coronavirus pandemic.Staff reported people not respecting closed areas, people on beaches and people not practising appropriate physical distancing measures. “Further to this, a considerable amount of garbage and waste was left throughout the conservation areas, in particular at Guelph Lake,” the organization said in a statement.Guelph Lake was even forced to open late on Sunday due to the amount of clean up that was required.Going forward, the conservation authority is urging visitors to respect the rules and restrictions that are in place.It said if staff.