ABC Stores are perfect for Vegas. There is one downtown and several on the Strip. They have a great selection of souvenirs, snacks, shirts, alcohol, toiletries, and plenty of bottled water. Everything you need while on vacation, all in one place. And very reasonably priced.
The best thing about ABC Stores? Lots and lots of Hello Kitty! Keychains, magnets, shirts, iPhone cases, note pads, pens, beach towels, tote bags, etc. It's a Hello Kitty lovers dream. I always go home with at least one new Vegas Hello Kitty shirt!
They also have some very pretty Hawaiian jewelry and hair accessories. And plenty of nail polish and lip gloss. So if you forgot something at home or just want to try a new shade, stop in and check them out. It's a fun little store.