Camp Tonkawa is part of the WWOOF-USA program.
From their website:
"Worldwide Opportunities on Organic Farms, USA (WWOOF-USA®) is part of a worldwide effort to link visitors with organic farmers, promote an educational exchange, and build a global community conscious of ecological farming practices."
You can learn more about WWOOF (and sign up, if you like) on their website: WWOOF-USA®
Testimonial: “To my favorite friends from the sates, It is already close to a year that we have been working, eating and laughing together. Miss you a lot. Hope everything is going well....with you, the horses, the dogs, chickens etc. I always follow your posts on Facebook with a smile on my face! You are so lovely and heartwarming people. Hope we may meet again, Eva” - WWOOFer from Germany