Do my wife & I require visas to travel to the destinations shown below? We have UK Passports.

Travel Date 8 October 2016. Glasgow - Dubai - Hong Kong. 2 nights stay in Hong Kong. Royal Caribbean Cruise commencing 11 Oct. Hong Kong - Singapore, calling at Sanya (8 hours), Nha Trang (11 hours), Ho Chi Min City (32 hours) and Singapore, including 1 night hotel stay. Singapore - Perth, staying with relatives for 10 days. Return date 30 October Perth - Dubai, 31 October Dubai - Glasgow. We have received various conflicting responses to this question and need written confirmation urgently to reassure us.
Andrew & Margaret Keachie