Wow, what a day! We got lucky with the weather - we woke up to blue skies and beautiful views of the glacier from the town. Fox Glacier Guides provides all the gear to make you comfortable on the ice. We walked around the ice in a group of about a dozen with our guide, Ang, for about 4 hours. It was amazing. Very leisurely walking, wearing crampons. Because Fox Glacier is relatively flat, we didn't have to wear a harness or follow a fixed line (though you're following the guide's route). There weren't any ice caves when we were there - we ducked through a little ice overhang which was very cool - but it changes every day.
The guides pointed out different features, told the history of the glacier, and tailored the trips to the guests interests. It was my first time taking a helicopter, but we both found the ride very quick and comfortable.