The shuttle runs from 1 p.m. to 8:30 p.m. every Tuesday through Sunday. You do not have to be a AAA member to ride the free shuttle. The main stop is at the Downtown Container Park (7th and Fremont Street) with additional stops near the Fremont Street Experience and The Donut Bar.
You can find out more about the shuttle here: http://www.aaahoponlasvegas.com/
They are also running a publicity campaign for one lucky couple to get married on the shuttle on June 30th, 2018. Entries must be submitted by June 20th.