Kamaole I, II, and III
Three steps from South Kihei Road are three golden stretches of sand that are locally, and quite disrespectfully, according to Native Hawaiians, known as "Kam" I, II, and III. Although they're separated by outcroppings of dark, jagged lava rocks, you can walk the entire collective length of them if you're willing to get your feet wet. In the morning, the water can be as still as a lap pool, so the swimming is great. All three stretches also have lifeguards and wheelchair ramps.
The northernmost of the trio, Kamaole I (across from the ABC Store—important to know if you forget your reef-safe sunscreen) has a small parking area, a volleyball court, and a lawn; it's also the only beach on Maui with a beach-access chair for people with mobility issues. Kamaole II is nearly identical except that it has no parking lot or lawn. The last stretch, the one with all the people on it, is 10-acre Kamaole III, a great family beach, with a playground and barbecue grills. The kite-flying here is good, and the terrific breaks attract beginning bodysurfers. Amenities: lifeguards; parking (no fee); showers; toilets. Best for: sunsets; surfing; swimming; walking.