Our tour guide was Al, he provided us with a very informative and entertaining 8 hour tour of the Golden Circle, we visited the following sites with plenty of time to explore on our own. Thingvellir National Park, Geysir Geothermal Park, Gullfoss Waterfall and Faxi Waterfall.
We had roughly 45mins - 1 hour at each stop. There was a 2 hour stop at the Geysir Geothermal Park, there was a really nice place to eat there too after watching the Strokkur Geysir errupt a few times. There were a lot of hot springs to view there too.
Due to the couple who also had tickets to the Secret Lagoon in our tour, we also visited Litli Geysir which was at the Secret Lagoon when we picked them back up. (Just an FYI, as that couple had tickets to the Secret Lagoon, they only got 1 hour at the Geysir Geothermal Park)
Overall the tour was very enjoyable, Al was very informative on the geological and historical facts, pick up & drop off was stress-free.