The water is clear and inviting in Hawaii but watch the currents. Know you ablilities before swimming or surfing and always ask the locals about any rips or dangers. If you see no one swimming or surfing, it's probably for a reason... Don't go out.
Hawaiian waters can be plagued with the invasion of jellyfish, especially after a full moon. The sting of a jellyfish can be dangerous, quite painful and leave a lasting scare. The main types of jellyfish found of the shores of O'ahu are the box and Portuguese-man-of-war.
Use caution when swimming in the ocean waters and head any warning signs that are periodically posted warning of jellyfish in the waters.
The sun in a torpic climate is strong, and even if it doesn feel like the sun is beaming down on you while you are out and about walking or at the beach, it is important that you apply sunscreen. If it is too hot out please use caution and get under some shade or inside an airconditioned location. Drink plenty of water and cover up.
Fair skinned individuals should use extra caution by using a hat, sun glasses and covering up a bit more and definitely re-apply the sunscreen throughout the day.
By using sunscreen and staying out of the sun when it's too hot will guarantee that you'll have a wonderful trip. So apply, apply, apply.
As usual, common sense is the key to all safey issues. It is extremely important to watch out for and obey all safey signs while enjoying the beautiful pacific ocean. Be mindful of your surroundings and try not to venture out in the ocean on your own.
The pacific ocean can have some very strong currents, big waves and undertows, sharp coral reefs and dangerous sea creatures, be on the lookout.
If you are visithing the North Shore Beaches of Qahu, it would be wise to look for and read the signs posted on the Beaches.
The waves in these areas can be enormous and swimming will not be allowed.
Take notice of the warnings at the beaches. A strong undertow could easily drag you offshore and get you into difficulties.