I think there's one that spawns in San Fierro. Starting at Angel Pine, you take the highway going northbound, and you get close to the city. There you find an intersection and you'll have the option of going straight or right. Take the right and go up that road that winds up the mountain, and there should be a bus at the top by another vehicle.
Sorry if my directions are a little confusing, I'll try to make a map. --- "But don't time travel for long periods of time, 'cause weed will grow & its not the kind you can smoke." -MonkeyFriday on time traveling in AC:WW
Here's my map: http://img380.imageshack.us/img380/5152/sanfierropv5.png
Just follow the route in red. The blue dots are safe houses (because it's the only decent map I could find), and I circled the location and put the word "Here" by it. Usually, if not always, a bus spawns there. --- "But don't time travel for long periods of time, 'cause weed will grow & its not the kind you can smoke." -MonkeyFriday on time traveling in AC:WW
My method on the ps2 version of this game was to get yourself down to the docks in the first city[ early in game that is] and jack a coach. Then the gta phenomenon that makes like vehicle types/classes spawn on the roads happens after a couple mins driving . Then when you drive near a bus , block its path and jack it .
A coach looks kind like a bus* Usually one on the road near the docks for me every time I go there .