We're doing the Wild By Nature class in October and I'm not too worried. Like you, I plan to bring lots of water and face cloths to soak if it gets too hot. However, this class sounds like an amazing and cool way to experience AK that we wouldn't normally have. It's in the morning at 8:30am and should be done by 11:30am. From what I've read, part of the tour is on the safari (covered), part of it is on the Maharajah Jungle Trek (lots of shade) and part is on the Pangani Forest Trail (partly covered). I'd imagine that if it gets too hot, the tour guide would make water stops as well.

We're really looking forward to it!