According to the wonderful AI that helps me identify the birds and animals in my photographs:

These birds are commonly found in Hawaii during the winter months, as they migrate south from their breeding grounds in the Arctic. They are often seen wading in shallow water or mudflats, probing for food with their long bills.  

The bird in your photo has the characteristic long, straight bill of a dowitcher, and its mottled brown and gray plumage is typical of the species in its non-breeding plumage.