Good beaches in Oahu
Sunset Beach
sunset, long walk, snorkeling, north shore
Hanauma Bay
crowded, good snorkeling, the view from the top is awesome (drone)
Ko Olina Beach
Good for swimming
Lani Kai Beach (Kailua)
I like it, seems not crowded
Makaha Beach Park
good view, lifeguard, not many supply around
Alan Davis Beach
Kaiwi Shoreline Trail, must go