Las Vegas does offer some interesting and unique options for cooling off.
Luv-It Frozen Custard is a family business that has been operating out of the same premises, on Oakey a half-block east of Las Vegas Blvd. and a half-block north of the Stratosphere, since 1973. It's a little shack with a walk-up window that serves the creamiest, silkiest, sweetest, frozen concoction this side of Margaritaville. Similar to ice cream, the custard has an egg base, so it contains less sugar and milk fat and no ice crystals. Less air is whipped in, so it’s richer and melts more slowly.
The custard, which comes in 20 different flavors, is prepared fresh daily from secret family recipes that date back nearly 40 years. It's a bit pricey, perhaps 20%-30% more expensive than regular ice cream, but it's well worth it. Luv-It also serves 20 different sundaes, plus malts, shakes, and floats. The custard is also served in cones, cups, and hard-packed pints, quarts, and half-gallons; the signature menu items include Luv Sticks (frozen custard bars on a stick, available in all flavors) and chocolate-covered frozen bananas. The hours are 1-10 p.m. daily (11 p.m. on the weekend) and note that only cash is accepted.
Our final suggestion, in what is by no means an exhaustive list, but hopefully gives you a good flavor of some of the more unique cool treats Las Vegas has to offer, would be the Minus 5 Ice Lounge, which has locations in Mandalay Place, Venetian's Grand Canal Shoppes, and the LINQ Promenade, and comprises a bar made entirely from carved ice -- the walls, the glasses, the sculptures, the bar itself. As with the Vodka Locker, appropriate attire is provided before entering and you can only stay for fifteen minutes or so before moving on to thaw out in the Minus 5 Lodge, which goes for a log-cabin ski-lodge effect with ironwood beams, river stones, leather seats, and an open-hearth.