If you're looking for skate related ones, I highly recommend Ethiopia skate. I'm pretty sure everyone here has heard of Skatistan and they have locations in Phnom Penh, Cambodia / Capetown, South Africa / and Kabul, Afghanistan. They're a bit harder to get into skate wise since they prefer to hire locals but you could probably work in one of their offices. There's also girlskateindia which, despite the name, is open to dudes helping out.
Other more lax volunteer options could be joining a website like Helpx, Workaway, or woofing. I'm not a fan of the farm work since a lot of people get exploited doing it these days. A lot of farmers' may treat you like an illegal immigrant. Just sayin', check the references on those. You can also teach English for a year and make good money, relatively speaking, in a foreign country and get involved outside in the community outside of that. There's also working holidays depending on your age.
If it's what you want to do, I'd say go for it. Traveling will broaden your horizons and it'll all work itself out in the end. You'll make experiences and friends you'll keep for the rest of your life. Some people/industries/cultures may frown upon doing such a thing but there are plenty that respect it.