hey Costas, there are bunch of nice spots to ride, depending what you are looking for ..... flat land or hills ...... around Kosice it's mostly flat, but when you go little north, north west ... you will find nice mountains for freeriding ... you can find more info on local web site
www.kiting.sk .... but it's in slovak language, so if you have somebody who can help you with transtation would be nice, if not let me know and will hook you up with some locals there. one of the best spots are Martinske Hole,
www.martinky.com , Vratna
www.vratna.com or anywhere around towns Poprad, Liptovsky Mikulas, Zuberec ... located in High Tatras, Low Tatras, West Tatras
check this out too
http://kiting.sk/content/blogcategory/15/109/http://www.snowkiting.cz/lokality-reviry/?sfilter=1http://www.mushow.cz/reviry/reviry.phplet me know if you need more info
duloid