LisaCat, on page 124, post 1860, there's a picture of the shuttle schedule in effect during our trip in February, the week before school vacation. Others have since said it pretty much agreed with the schedule when they were there. I think they may add some buses in busier times, but the schedule posted seems to be fairly standard for the less busy times. Hope it helps.
That's really good info. Looks like the buses are really flexible going and coming back. I was afraid they would only run a few hours in the a.m. and then a few hours in the p.m. and we'd be stuck there during the hot afternoon when we usually take a break. Thanks for reposting this. It's hard to find things when the thread is so long.