The phrase "good ambassadors" means people who represent something or someone well and positively. They are like messengers or representatives who promote a positive image. Full definition
He is a very good ambassador and role - model. (justarsenal.com)
Throughout the week and during the race, knowing that our cars lacked the pace of the Fords and Ferrari, our Corvette Racing team acted and performed like the true professionals they are and we couldn't ask for better ambassadors for the Corvette brand. (corvetteblogger.com)
He urged the Pilgrims to serve as good Ambassadors of Ghana by complying with the rules of engagement by the host nation. (citifmonline.com)