@boxmining I'm originally from Bulgaria and been passing through Croatia a few times already and it's been very popular for the European Jet Set people to meet there.
Also been living in France for 10 years and visited South of France a few times and it's also an amazing choice the French Riviera.
To answer your question I think Croatia is a good choiceand its still hot the month of September. The weather in France might be colder but again it depends on each year.
Enjoy your vacations and keep us posted for the news of Crypto world.