How should I target my potential customers? (guerrilla marketing?)?

[privateeye]

i have a rent a tour guide service, which lets you rent local people to show u round the city. i live in asia, but basically, my clients are anyone who comes to my city. so where should i start advertising? i don't have that much of a budget. i want to do something creative that will target many customers at once, worldwide.


and please don't say Facebook!