One of the things to do in Honolulu for free is to enjoy some hula shows. The Ala Moana Center has a hula show at 1:00 pm inside, where it’s nice and cool every single day.
Halona Blowhole was formed a long time ago from a volcanic eruption. When the waves are strong, you will see water spray out from the holes, creating the blowhole.
At Hanauma Bay, it only costs $25 and gives you a huge selection of exotic fish and even some turtles too! It is one of the best places to snorkel on the island and is not too expensive either!
To see the Pacific Fleet Submarine Museum costs $21.99. If you want to see just the Battleship Missouri Memorial it’s $34.99, and Pearl Harbor Aviation Museum is $25.99.
The Diamond Head hike is one of the most popular hikes on Oahu and is definitely worth it when you reach the top. You will see some incredible views that you won’t find anywhere else.