The TI/Mirage tram is a nice little option to have. We stayed at the Mirage on our recent visit to Vegas and decided to check out TI since it was right next door. The tram will save you about a 5-7 minute walk. Basically the walk out to the strip from the Mirage and back into TI. It's nice, especially in those Vegas summers. It's free, which is awesome..but honestly, it wouldn't be worth a charge if they did ever decide to implement one. It's clean and I believe it stops every 15 or so minutes.