Slovenia - 7 lakes in the Triglav valley

http://www.lifetrek-slovenia.com/en/mountaineering.php?sub=39&id=58

http://www.hikenow.net/LakeTriglavValleyWalk.html

Garda lake!

http://www.walksofitaly.com/blog/como/italian-lakes-garda-como

Split and surrounding islands in Croatia

There are direct night trains to Split from Keleti from the middle of June until the end of August. Otherwise it's quite difficult to get to Croatia now, since there almost aren't any public transportation to get there....
http://www.mav-start.hu/res/1204_1205_adria_13.pdf

It's easy to get to many little islands in the surroundings by ferry!

Brac

 Korcula

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Hvar

http://www.campingcroatiahvar.com/