Slovenia is small, and most sites of Jewish interest are within a couple of hours’ drive from Ljubljana or Maribor.
This article by JHE coordinator Ruth Ellen Gruber provides an easy itinerary to visit the Jewish heritage sites in Slovenia — but beware: the article dates from several years ago, and many of the links that are included are outdated or no longer work.
The Slovenian Tourist Board’s official online travel guide provides detailed information on several Jewish heritage sites around the country.
Premk, Janez and Hudelja, Mihaela. Tracing Jewish Heritage: A Guidebook to Slovenia. Ljubljana: JAS Research & Documentation Center, 2014
A detailed, comprehensive, and richly illustrated cultural guidebook — in English — to Jewish heritage and history in Slovenia; the first such publication in Slovenia by a Slovenian research team. It includes history, maps, illustrations, sites. Co-author Janez Premk presented on this project at the Krakow conference on Managing Jewish Immovable Heritage in April 2013. (Click the link to see the session where he presented).