Indeed. People planning their summer holidays are just not thinking this through. This vaccination protects from severe symptoms. It does not prevent transmission. The world is not going to open up with no restrictions so people can sit on the beach.
We can expect the vaccines to reduce transmission though. My take is “normality” is some way off at the moment. It will take a while for the virus and the various mutations to be under sufficient control so a relaxation of rules can start. And even then it will be gradually.