This was taken at a wedding I attended at Lanikuhonua, just a little ways down the beach from Aulani. The grounds are private, but you can access the area by walking along the shoreline. There are some areas that are just wet rocks, no sand, so wear shoes with good traction. The wedding photographer said it's pretty common to see pink/purple sunsets like the one in the (unedited) photo during late winter/early spring.