Not too long, not too difficult, right next to the sea, perfect crawling place! Make sure to look ahead and plan your steps carefully, so you don't get lost in the caves.
Big chunky target. Accuracy there shouldn't be much of a problem. But the target's resistance might be. Aim for the engine on the back of the bus to immobilize it effectively, or if not possible, aim for the wheels. Stopping it otherwise is very unlikely.