Tell me your favorite secluded beach in the islands?

The Red Sand Beach in Hana.

Tunnels Beach on Kauai - and actually, there's the western side that is more public, but if you can find the road/path, there's a more "eastern" side (east of the rocks) that more locals know about.

Enjoy!

On Maui if you go past Wailea and keep driving along the coast you will come to a secluded, "locals" beach called Big Beach. It's a stunning each but I do advise the swell is a pretty big shore break on most day and u usually can spot so crazy locals body surfing these huge breaks.

Polihale Beach in Kauai is about a secluded as it can get.  And beautiful too.  

Here's another shot of Polihale Beach taken with the mountains to my back.And south of Polihale Beach is another very nice beach called, Kekaha Beach.  I saw some incredible and vibrant sunsets along this beach, like the shot I took below.

On Kauai, your best bet is to find a beach on the north shore of the island. Moloa‘a Beach is beautiful and it's rarely crowded. You will have to park and walk a couple blocks to get to it. 

The Kalalau Trail along the Na Pali coast will bring you to a beautiful secluded beach about two miles in. And if you're feeling adventurous you can hike another two miles to Hanakapi 'ai Falls.My favorite beach on Kauai has got to be Hanalei. It might be a little less secluded but in my experience it's never crowded, plus it's where a lot of locals go. Beautiful views of the mountains and and the best conditions for swimming or stand-up paddling! Hope this helps!

Hello,

I came across this web article about the top 10 beaches on Maui. Here is the link. http://www.gadling.com/2010/08/05/top-10-maui-beaches/

Out of all the beaches listed inside of here, my favorite was the La Perouse Bay. It is a part of the Ahihi Kina'u Natural Preserve. It is on the south part of the island past Wailea Beach. You will have to hike in across the lava field so make sure you have really good shoes. You will come to this area that is a circular bowl. The locals call it the fish bowl. Make sure to ask a local where to enter to get to the bowl. It is a marine preserve and has the largest most beautiful tropical fish all in one area that I have ever seen. You actually feel like you are swimming in an aquarium. It is worth the hike across the lava. Pack some band aids and a sandwich. There is no first aid or food around close.

On Oahu, be sure to check out Kawela Bay. It's on the North Shore, just west of Turtle Bay Resort. It used to be a best kept secret, but the secret is out. Any good map will show it. You can access it by walking from Turtle Bay Resort, or park along the road across from the fruit stand and walk in a couple hundred yards through the banyan trees. Walk out the the Rocky Point for great views. You can also walk NE from Turtle Bay (park there, it's cool) for hours and see many secluded beaches and coves. This is one of my favorite places to hike, and it gets secluded rather quickly. You will likely see turtles and seals ashore. Sometimes there's a trail, sometimes not. Just stay along the coast. Also check out Lanikai Beach (in Kailua) and Bellows AFB (in Waimānalo). Neither is secluded, but both are amazing! A hike out to Kaena Point is also rewarding, but it's more "coast" than beach.

On Maui, check out Little Beach. Go to Big Beach, then climb over the rock pile at the NW end of the beach. Clothing optional at this beach, and Sunday afternoon is a drum circle. Great place to get in touch with your inner hippie, if that's your thing. Also nearby is "fishbowl", a tide pool that is great for snorkeling and is about a one-mile hike from the road over lava rock. A little online research will give you better directions.

I'm not as familiar with Kauai, but Hanalei is sweet, and the Kalalau Trail will take you to a nice beach just a 2-mile hike in.

There is an outstanding book series called "Revealed" as in "Maui Revealed" and "Oahu Revealed". Check 'em out!