Awesome program! I narrowed down my gap year (between college & graduate school) to either the Peace Corps or UWP. I chose UWP since it was for 1 year rather than 2 (now you can choose 6 months or 1 year with UWP). It was one of the best choices I've ever made.
The reason I joined was primarily for the host family & community service experiences. I knew I wanted to be a family therapist, so thought those experiences would be helpful (& a good resume booster!): it was! I loved living with so many different families & experiencing cultures first hand from around the world. And, by visiting & helping at nursing homes, prisons, schools, ... I got to see just how much I really enjoyed working with people. I ended up taking a little more gap time before graduate school. The job I got (working with teen moms) was purely because I traveled with UWP: my boss loved a "worldly" person and someone with all the experience I had with diverse groups of people.
There are several internships and skills to learn while on the road: sound mixing, lighting, education, dance, singing, logistics, promotions, ... I was not much of a show person, but enjoyed our performance. I could sing, so was put on the microphone group (the sound the audience primarily hears), but never tried out for a solo. Over time, I decided to do more behind-the-scenes work, so learned sound mixing (using a monitor mixer).
The non-profit was founded by a group called MRA (a Christian group). It switched to being UWP just a few years later and became non-sectarian. It's an incredibly open-minded organization and strives for diversity of it's cast members & staff: politically, ethnically, culturally, religious values, sexual orientation, etc.
Today, about 28 years later, I'm still in touch with about 125 cast members/staff. It's like the gift that keeps on giving.