The Czech republic is a landlocked country, with very much to offer the cycling tourist. Check out the ride from Prague to Karlstejn Castle, the long river valleys and meandering paths. You'll rarely come across too much traffic.
The most well known cycle route in Hungary is the Danube cycle path. There are guided and self-guided options along this stretch of blue sparkling river. You could go all the way to Vienna!
The Julian Alps, Mediterranean coast, Karst region and all the special surprises await you in Slovenia.