Roger,
I use to use Scala film for photographing my black and white prints into slides for various portfolio things. Since the invention of all the computer stuff, I haven't used it since. Since you have it, you might as well use it one something. You will not have a lot of gradation as you normally would on traditional film, so if this is important to you then you are better off using b&w. Also, if you were planning to make traditional black and white prints, you will need to make a black and white internegatives first. However, if you are scanning the slide film and then making prints you should not have any problems. I would also slightly overexpose, depending on the lighting situation, by 1/3 stops.
Wow, everybody seems like they are going somewhere interesting. You are going to Machu Pichu, and this other guy is going to Nepal.
Well, have a great trip. Are you hiking up the trail, or taking a helicopter? Be careful of the Altitude sickness.
Is anyone else going somewhere?