The Deuce is seriously the most underrated amenity available on the Las Vegas strip. For only $8 you get unlimited rides for 24 hours. I prefer it to the monorail because instead of having to weave in and out of hotels (since the rail is located behind the strip) the Deuce has it's stops directly on the strip in front of key locations.
I love walking the strip and people watching but the bus has a serious advantage if you need to make it from one end to another on a time constraint. Added bonus is that it takes you to the Fremont Street experience as well.
Way cheaper than a taxi and I feel safe using it since I know that I literally cannot get lost using it since it's course is just up and down the strip.
You can also buy passes for 2 hours for $6 or for more time as well.