We got this tip from a lovely Russian girl that we met on day 2. Download the RTC app and purchase a bus ticket (you can also purchase tickets from the kiosks at some of the stops) $8 for 24 hrs. You can the use the Deuce or SDX buses which are hop on hop off buses that begin at the start of the strip and go all the way to Fremont Street 24hrs a day. They come past each stop every 10-15 mins or so, so you can hop off, have a good time then hop back on when you're ready to move on. The best Vegas tip we got.