Shop! Ok, shopping might also be considered a sin, but I’ll let it slide since it’s at least not the first sin that comes to mind when you mention Las Vegas.
If you wanna shop in Vegas there wont be enough time to browse stores. There are simply too many stores! My suggestion is that you start off at Fashion Show Mall. You can find everything here! Don’t forget to check out the department stores like Macys, Nieman & Marcus and Nordstroms. You can find a lot in there mens departments. Another favourite is Abercrombie & Fitch which have really comfy grind clothes.

If you couldn’t find what you were looking for there, no worries. Almost all hotels along the Strip has it’s own shopping street inside the hotel. Best is without a doubt the Forum Shops at Caesar’s Palace. There you will find everything from Victoria Secret to Fendi and D&G.
If you continue south on the strip you’ll see Planet Hollywood and their Miracle Mile shops. Another really good option if your VISA is burning a hole in your pocket. Hotels like Venetian/Palazzo and Bellagio also have good shopping, but slightly more upscale.
When you feel that the The Strip no longer has anything to offer I suggest you jump into a cap and go to Premium Outlets. Here there are lots of bargins to be made especially in the sports stores and my personal favourite, Ralph Lauren. Don’t forget to try the fudge:8

If you feel like shopping “off-Strip” I suggest The Boulevard mall which is located straight east from the Wynn. Another option is Meadows mall which is a little west of the norther parts of the Strip. The best option however is probably, Town Square, which I discovered last year in the good company of Johan StorÃ¥kers. It is a bit off strip but very nice and quiet and lots of stores. Well worth the trip!
Also don’t miss the worlds largest gift shop (in Vegas?), Bonanza!
Shop til you drop