This article mentions smart applications and their value in tourism development. The findings show the suitability of smart tourism technologies in destination management and their role in improving tourism activities towards sustainability while ensuring socio-economic and environmental objectives with the participation of stakeholders in the tourism development in Phu Quoc. The solutions presented in this article highlight the great potential of applying smart technologies to compete and implement responsible tourism in the context of Covid-19 pandemic and Phu Quoc is aiming to open the application of Vaccine Passport.