Waimea Bay Beach- Haleiwa
This is the beach where you can get activities for kids as well as for teenagers
Baldwin Beach Park — Paia
You can have there a little tots protected swimming pools, Baby Beach in the west, and Baldwin Cover in the east.
Lydgate Beach Park — Lihue
This is the safest beach in hawaii with enclosed swimming area and lifeguards as a toddler friendly
Ko’Olina Beach — Kapolei
Ko'Olina Beach, which relates to "fulfilment of joy," is a lovely 2-mile beach made up of four man made lagoons.
Hanauma Bay State Park Beach — Honolulu
This beach found in Volcanic Cone and you can enjoy seeing green sea turtles, and much colorful fish like parrotfish.