Where in Slovenia, and are you prepared to do an overnight (or two) on the way ?
Pecs is very different to Budapest, but it is a detour - it takes as long to get from Ljubljana to Pecs as it does to get to Bpest. If you decide on Pecs, take the road to Nagykanisza, then go via Kaposvar.
After a night (or two) in Pecs, you could head across to Baja and then follow the Duna (Danube) up to Bpest. Kalocsa, the centre of a paprika growing area and a nice wee town, is on the way. You could even take a short detour to Mohacs, site of one of the decisive battles in Hungarian history (a defeat, sadly).Edited: 28 February 2014, 14:10
If you would like to visit a beautiful and absolutely not touristy area, the Őrség National Park is on the recommendation list. This is centered around the municipality of Őriszentpéter. Considering that you are heading from Ljubljana to Budapest, this may be a bit of a detour for you, but it depends on the amount of time you have. (Border crossings to this region: Hodos (SLO) - Bajánsenye (HU), Lendava (SLO) - Rédics (HU)). In the vicinity of Lake Balaton, you may include Sümeg castle in your itinerary. Along the shore of the lake, Keszthely (Baroque palace), Badacsony and Tihany (Benedictine abbey and a fine panorama) are definitely worth a visit. However, in the Balaton Uplands area, Tapolca (cave with a lake inside) and Nagyvázsony (castle) are also good destinations. Székesfehérvár has a nice Baroque old town.
All these locations are on the route from the Slovenian border to Budapest.
Have a pleasant trip!
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