We finally got to talk to him yesterday. He is having a great time. He feels really tired, but is thoroughly enjoying the trip and feels good.
He said he is really tired (it couldn't have anything to with the fact that he is on three medicines all of which make you tired and he has had jet lag), and he is having to take an additional dose of the anti-nausea medicine. He thinks that is necessary because he is active in the morning on the trip, and it was likely he slept through it at home since he slept in more here.
One of the Mom's on the trip said he is tired, but so is everyone else. If she didn't know better, she wouldn't know he was on chemo medicine.