To avoid the sun for an afternoon game at Aloha Stadium, you'll want to consider seats on the west side of the stadium. The sun will start setting behind these sections and you'll be the first to receive shade. Sections on the west side include F-Q.
For even better protection, consider seats in the highest rows of the Blue or Yellow levels (sometimes abbreviated BL/YL). These rows are covered by an overhang which helps keep you shaded and cool. Finally, nearly all Brown (BR) level sections are covered and shaded and offer a great perspective of the game.