My go-to place for ice cream when I come to Vegas. I'd recommend the frozen hot chocolate and any of their ice cream sundaes. I have tried several the classic hot fudge, the deep fried oreos and the black and white. These are all very good and won't disappoint.
Some of their food options are a bit pricey, but you're in Vegas? The foot-long chili dog is really good and you'll get a lot for your money. I've always enjoyed really good service here, but the wait can be grueling.