Eric,
Concerning camp issues, you may want to regard a recent entry by Jmaher. It's located under General Discussion, and it's titled "Rec TreeClimbing vs ropes courses". Moreover, Jmaher wrote an article that may parallel your interests. It's found through this link www.outdoored.com/articles/Article.asp?ArticleID=160 .
To help you get down to the nuts and bolts of tree climbing, it's simple. You can memorize "The Tree Climber's Companion" 2nd Edition by Jeff Jepson. It's the most quoted reference source in these discussions. To purchase this inexpensive 104 page book, I'll recommend the website http://www.newtribe.com/ . Everytime I make a purchase through New Tribe they give me a reason to come back. They worked with me on the shipping charge of a single book. The "other guys" didn't. You'll find other tree climbing references at New Tribe, which I haven't read. However, it's worth checking out "On Rope" from the local library. It presents good mechanics on climbing, but it lacks the speciality needed for trees that Jepson adequately presents. There are US Government documents that present a blend of facts found by these two sources being referenced. If that's of interest let me know and I'll provide the links. The Gov Docs aren't focused on recreation and just provide more reading.
Lastly, you may want to contact the people found through this website that put on courses. Where you are working with the general public as clients, you really should consider rescue techniques as part of your camp credentials. The benefit is that you can provide a safe environment for unique fun.
Regards,
JimK