ABC stores are like 7-elevens you'll find all over Hawaii - offering lots of souvenirs and sundries. Its also one of the better places to get Hawaiian nuts and candy. Hawaiian Host is probably one of their better brands for mac nut chocolates. The stores are also all over Vegas!
This particular location is super convenient, between Monte Carlo, the Coke Bottle, and MGM. They open late, have a huge inventory, and are brightly lit. The store is clean and the cashiers extremely friendly in their Hawaiian shirts. There is absolutely no reason to shop at gift shops inside casinos anymore - look for the closest ABC store and you'll find greater variety and much lower prices. I got discounted sunscreen and coconut water at 2 for $5 here.
The other plus for this location is that its right on the Strip. You'll find street performers in costume that'll pose with you for tips. Superheroes, celebrity impersonators, sometimes Disney characters. I had to do a double take yesterday night when I saw three showgirls promoting Hard Rock Cafe and one of them in pasties! Yikes - reminds me of NYC Times Square. The downside - its near the Strip and next to two major crosswalks so super crowded outside!