There is no other place in Vegas for all your camping/hiking/biking/climbing/outdoor/recreation needs in one place.
I have bought mountain bikes, sleeping bags, hiking boots, winter gloves, kayak paddles, jackets, yoga pants, and so much more...even hiking booties for my dog, and squirt guns for my nephew! The point here is that they have a lot of gear...a huge selection...many much mousens worth of things that you need! And really good prices too!
I am a huge fan of their membership program though. There is a one time fee if you want to join and then every year around tax-time you get an REI credit posted to your account. Free money to spend at REI! That simple...a percentage of everything you spend that year! If you don't want to join that's fine...it won;t cost you any more to shop here.
The simple fact is that if you haven;t been to REI then you are not active enough...so go out and do something!...and if you need some gear to do it chances are you can find it at REI.