This is the classic white sandy beach. Not going to say it is the "best" beach on the big island because each offers something unique. But, this is a beautiful beach that is worthy of it's world class status. More geared to relaxation than activity.
Very limited public access means less crowds. However, you need to arrive early. We arrived at 8:45AM and was #22 of 30. Hotel has a very organized structure in place to limit access to the public to only 30 parking stalls. Once these are gone, you are pretty much out of luck. Shear luck to arrive in afternoon to coincide with the departure of one of the 30 public guests.
If you own or manage Mauna Kea Beach, register now for free tools to enhance your listing, attract new reviews, and respond to reviewers.