The town of South Park isn’t that large but it can be hassle to navigate the town on foot, especially if you’re going through various quests and missions. Fortunately, there are strategically-positioned fast-travel points around town that you can activate and use anytime you need to. (except when a quest prevents you from doing so) They are not activated from the start so you still have to manually find them on foot for the first time and “discover” them to activate them permanently. Take note that some of the locations in town isn’t available until you progress in the game. Discovering and activating all fast-travel points will also unlock Fastpass's character sheet.