1. Loftek Floating Pool Lights ($35)
Keep the party going after dark with a set of pool lights that float on the water's surface. A remote lets you set the color of each LED light and how it changes. When the night ends, they can be used as bedroom lights too. Buy it at Amazon.
2. Intex InflataBull ($35)
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Behold "the best thing that's happened to pool parties since the pool itself." It's hilariously difficult for a rider to stay atop this big, rideable bull — especially when others are tugging at the side handles. Buy it at Amazon.
3. Watermelon Ball ($25)
This all-ages water toy acts like a real watermelon when thrown into the pool — making it perfect for rugby, football, or plenty of other games. You fill it with water before using it, giving it near neutral buoyancy. Buy it at Amazon.
4. Cuisinart Mix It In Soft Serve Ice Cream Machine ($72)
"Heaven on a hot day," this sturdy machine can make soft-serve, sherbet, sorbet, or frozen yogurt. Better yet, it lets you mix in up to three toppings as it fills a cup or cone. Buy it at Amazon.
5. Polywood South Beach Lifeguard Chair ($559)
Somebody has to rule the pool and shouldn't have to do without a proper perch. Made of marine-grade plastic composite, this chair comes in 13 colors and has a 20-year warranty. Buy it at Amazon.
Editor's note: Every week The Week's editors survey product reviews and articles in websites, newspapers, and magazines, to find cool and useful new items we think you'll like. We're now making it easier to purchase these selections through affiliate partnerships with certain retailers. The Week may get a share of the revenue from these purchases.