The Container Park
Located just off Freemont Street, this is essentially an outdoor mall, constructed of stacked shipping containers. There is a live music venue in the center, a huge play-place for kids, lots of boutique shopping, killer drinks, and great eats. Great place to stumble around for a couple hours.
I probably didn’t need to tell you about this one, and although it is essentially just booze and gambling, I think that the overhead light show, street performers, and layout (much less walking) make it much more enjoyable than trekking up and down the main strip.
This is the hip up-and-coming area of Vegas right now, and is a great place to stumble around enjoying the galleries and street art. Be sure to checkout Hop Nuts Brewing while you’re in the area.