With all beaches in Hawaii, I always recommend locking your doors and not keeping any valuables in the car, even if they are hidden.
These hikes are of varying difficulties. A few can be done with small kids, even strollers (Makapuu). Most are for children who like to hike and enjoy the challenge.
If you are visiting Hawaii, I always recommend seeing at least one luau because there you will get to enjoy some Hawaiian food where you might not eating out and about. Some of these luau's are located at hotels in Waikiki so you might not even need ...