My husband and I went canyoning and caving during our first trip to Slovenia in June.
Our canyoning guide, Ricky, took us for a full day (7 hrs) of canyoning in Predelica. The views were amazing, and the canyoning was challenging and exciting. It was just us two and Ricky, so we had a fun time chatting all day, and he recommended some great local food and drinks for the evening. He was extremely knowledgeable, and made sure we were feeling safe and having fun the whole time.
The next day, we went caving with Rolly at Srnica. We had a blast crawling, climbing, and squeezing through the caves. Rolly was also extremely knowledgeable, and we really enjoyed spending the morning with him.
Highly recommend both activities for anyone with some climbing/canyoning experience