Dive holidays? Nothing has been decided yet but the signs look promising. Croatia is negotiating with Slovenia, Austria and Germany about an Adriatic corridor, which should enable you to enjoy a wonderful diving holiday. On 18 May we expect the first corresponding decisions.
The following links will give you current information that might help you to plan your holidays.
https://www.sea-help.eu/en/news-general/coronavirus-situation-croatia-positive-border-opening/
https://civilna-zastita.gov.hr/ (translate with Google)