Carinthian Lakes

Hello, who fancies a long weekend from the end of August (into the warm September) to a lake in Carinthia? I'll be traveling by train from Vienna. I'd love to explore Weissensee, Ossiachersee, Faaker See, or Millstätter See. I'd like to go swimming and also rent bikes to cycle around the lake or explore the area. I'm 34, from Vienna, a non-smoker, easy-going, humorous, empathetic, considerate, and caring. I'd be happy if you were similar in nature. But I'm also open to other lakes in Austria, e.g., lakes in the Salzkammergut (Attersee, for example) with bike rentals to cycle around comfortably. Where in Austria do you also like to go for a short trip? Please let me know. I'm open to ideas. I also enjoy hiking, for example.