I wanted to review this hidden gem so more people can know about it.
The girlfriend and I were headed to the Rio to see Penn and Teller.. and we figuring we'd have to walk over the highway or cab to the Rio from the Bellagio, when low and behold, our concierge told us about the free shuttle service that Harrah's property provides to and from it's back area to the Rio.
I had purchased a few bubbly pops for the walk to the shuttle, and was informed they weren't allowed on. But the driver did give me a minute to finish them up before we departed.
It's a great service to get you to and from a less accessible hotel off the strip, and to one of the best shows in Vegas.
Just remember, as with most things in Vegas, to tip for each passenger as the drivers don't make much.
Just head towards the back of the Harrah's.. there is a parking area by their main entrance.. it's marked by signs, or just ask some staff.