According to the website for the shuttle service, its running starting 15 May.  Its running at a lower capacity of passengers but more vans are added as needed.  It runs on a schedule from 15 May to some date in the fall and then runs only on a will call basis.  On the GrCa NPS website there is a link to the shuttle page.  Check that out.  There is a phone number there you can call as well.

Found Myself Outside