At night the Saigon City Hall is really beautiful with the various lights and the temperature is very comfortable to walk around the city. We walked from the city hall to Rex Hotel and many other famous landmarks in Saigon http://www.virtualtourist.com/travel/Asia/Vietnam/Thanh_Pho_Ho_Chi_Minh/Ho_Chi_Minh_City-1470720/Things_To_Do-Ho_Chi_Minh_City-City_Hall-BR-1.html.