During my gap year I volunteered a month at both the Hawaii and Peten projects. Having worked at multiple conservation projects, ARCAS has been the most organized and effective I have yet to see. The work is dirty but rewarding. The Rescue Center in Peten is certainly the more mature and structured of the two projects and gives volunteers the opportunity to work around a wider variety of animals. That being said the laid back family nature of Hawaii was wonderful as well. Having worked at both I would definitely recommend ARCAS as a top choice to anyone looking to volunteer at a conservation project. The staff are welcoming and very knowledgeable and the facilities are continually improving. So come with an open mind and a desire to work around some of Central Americas beautiful wildlife and you will have a great experience!