usa – Regarding Muir Woods Shuttle

When you reserve a seat on the Muir Woods shuttle, the system is only asking you about the time you want to board the shuttle at Pohono St. (which is, I believe, the only pick up location; but correct me if I’m wrong). But it doesn’t ask for the time you’d like to go back from Muir Woods to Pohono St. At the same time, all tickets are round-trip. So I’m assuming you can take any shuttle back. Is that right? And if so, is there a schedule of shuttles that go from Muir Woods back to Pohono St.?