In places where there is no reserved seating, the size of your tip determines where the usher will seat you. To find out what show is playing where while you're in town, pick up one of the free entertainment guides found everywhere. A good choice for upscale shopping is the Fashion Mall, right on the strip between Treasure Island and the New Frontier. Most the big casino-hotels also have their own shopping arcade, the most famous of them being the Forum Shops at Caesars Palace. Besides gambling and shopping, there are plenty of other things to do and see in Las Vegas.
Many attractions are free or cost relatively little.
Practically all larger casinos offer things worth seeing or doing. You'll see magnificent rock formations, plus wild donkeys that plant themselves in the middle of the road so you'll stop and give them a treat. Numerous operators vie for your business. I would choose one recommended by the hotel travel desk. Have fun in Las Vegas, enjoy, and good luck.