3rd one is my fave. I like it because of the cooler tone is has. As well the formation of the rocks with the water in between them. And of course the clouds.
I have been to Maui twice in as many years and got married there last July. I love that place and these photos really capture the beauty of it.
I think number 2 is the best shot here. The color of the sky is outstanding, but I think the real reason it stands out to me is the "S" composition. I think it would stand out stronger if you cropped a bit off the right... If you're not seeing what I am, the rocks form an "S" with the bottom of it chopped off... which is fine because you feel like you are standing on it.