Informal:
* 'A'ole pilikia (Ah-oh-lay pee-lee-kee-ah) - This literally means "no problem" and is a very common way to say OK in informal situations.
* Maika'i (My-kah-ee) - This means "good" and can be used to express agreement or acceptance.
* 'Ae (Ah-ay) - This is a simple "yes" and can be used to indicate agreement or acceptance.
* Komo mai (Koh-moh my) - This means "come in" and can be used to express agreement or acceptance, especially when someone is offering something.
Formal:
* Ua maika'i (Oo-ah my-kah-ee) - This means "it is good" and is a more formal way to say OK.
* Ua pololei (Oo-ah poh-loh-lay) - This means "it is correct" and can be used to indicate agreement or acceptance in a formal setting.
The best choice will depend on the situation and your relationship with the person you are speaking to.