Our best tour of our trip! Our group did both large tour groups and small. Personalized trips are the way to go. We had Eric - most amazing tour guide - who was knowledgeable about the cave and answered our many questions. He was fun and interacted with our group which is a nice change from our previous large tours. The caves were different from any others that I have visited before (Bermuda, Texas, etc). It was fascinating to see how they developed from the eruption approximately 2,000 years ago. Already I am planning to go back to Iceland to see the rest of the country that I missed due to extreme winter weather. I plan on skipping the large tour buses and staying with the small groups. It is worth the money and is a better experience.