Marc Gold spends most of his time on the road. One month he may be in India or Afghanistan; the next he's in Cambodia or Vietnam, both of which he's visited numerous times. But he doesn't travel to see the sights. The retired community-college professor from San Francisco pursues his own brand of tourism: philanthropic travel. I go where the poor people are," Mr. Gold says. Everywhere he goes, Gold performs acts of kindness, both random and preplanned. He rarely spends more than a few hundred dollars. "For people who live on a dollar or less a day, $50 can make a big difference," says Gold, who has been dubbed "the shoestring philanthropist." [Traveling to India in 1989] led to an epiphany. "I'd thought you had to be rich to do such things," he recalls. "I realized I had the power to help change people's lives." Back home, he asked a hundred friends for small donations and was soon back in India with $2,200. He then set up a nonprofit charity and called it 100 Friends. Two decades later, 100 Friends has some 4,000 members worldwide, and last year Gold raised $200,000. He continues fundraising via his portable office: a laptop, a digital camera, and a cellphone. "This is 80 percent of what I own," Gold says during a stopover in Bangkok, pointing at two duffel bags stuffed with his clothes, dog-eared paperbacks, and his large collection of wacky rubber masks. The latter he uses for clowning around with children from Tibet to Thailand. "I don't need much, and I'm free."