***The CityCenter Tram, like the one at Mandalay Bay, is free, but the route is very small; it primarily connects the CityCenter to the Bellagio (Monte Carlo is also connected); it is actually not that far to walk from the CityCenter to Bellagio, but the tram does allow you to avoid walking outside when it is cold or having to walk through smoky casinos; the tram is clean and comfortable***
Parking is free at all of the casinos connected through this tram.