Took a day trip to Grinnell Glacier, (in GNP), with Luke as my guide! He was knowledgeable, very well prepared and made my experience super unique by bringing pack rafts! We got to float around icebergs and afterwards Luke made us a nice lunch. He made sure to make the experience whatever I wanted by offering various spots to float in and allotted however much time I wanted for pictures and rest breaks. We even played a small game after eating our lunch. I appreciate that 0% of the day felt rushed. A wonderful one of a kind experience, would recommend to anyone.