Luke is a great and personable guide. He led us on a Golden Circle tour stopping at the major sites (Thingvellir, Geysir, Gullfoss waterfall). He coordinated a snowmobile ride for us on the Langjökull glacier. Finally, he suggested stopping at another waterfall, Bruárafoss.  He is knowledgeable of Iceland history, nature, and of the sites that we visited.  We would definitely tour with him again and highly recommend him.