This is really an amazingly beautiful and scenic beach. You get views of Molokini and Kahoolawe islands.
It's a wide sandy beach with areas for snorkeling (rocks along the edges), boogie boarding (nice waves in the middle).
The sunsets are spectacular. You can walk the beach walk from Ulua beach to Polo beach. Wailea is the most picturesque. Ulua best for snorkeling, and Polo the least crowded!
Wailea beach 3 resorts, and gets crowded (dominated with chairs from the Grand Wailea). Still, there is always space for everyone. Can get a little rough in the afternoons with the southern swells, but calm in the mornings. People are out paddle boarding and even outrigger canoeing.