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There aren't any local buses to transport you within the centre (though there are minibuses from the centre to the main bus station, among others), so walking is the only realistic option besides renting a car. To be honest though, a car won't be necessary - to get to Sveti Naum, for example, there are regional buses as well as a daily boat for 600 Denars (10 euros), and the rest is all within walking distance