This was my favorite part of my visit to Iceland. The tour is a great way to see some of Iceland's natural wonders without the worry of renting a car and navigating the landscape yourself. It was especially helpful having the bus pick us up at our hostel. Our guide Oddur was very fun and knowledgeable in giving us a cultural, as well as environmental, background of the places we were seeing. These are some of the most unique places I've ever seen and shouldn't be missed.
If you do this tour, I'd recommend packing your own lunch since the cafeterias they stop at can be pricey. Wear sturdy shoes, because the rocks you walk on around Gulfoss are slippery. And definitely wear layers.