go the east side beaches, there's a big state beach sorta close to a pier the university uses to do fish stuff, and it has beautiful water and tropical trees that extend to within 10 feet of the waves
and the sand is awesome
waikiki beach is trash mostly (its fucking rocky as shit for one)
west side a ways down (40 minute drive maybe 50) has a great little beach with decent surfing and real nice sand, free parking and such.
there's a really nice town if you take the road thru the center of the island from waikiki, go thru a tunnel and you're getting rained on sometimes and shit
but its real cute, nice shops and close to some nice beaches and cool views
there's some haunauenamama bay which i advise you hike near first, then go down and swim and shits
it's a gg