- Lanai Island has dive sites popular for their lava formations ranging from archways, tunnels, ridges and pinnacles offering wide variety of marine life and lighting effects. - Molokai Island is a natural sanctuary in which its entire South side lies in the longest Hawaiian barrier reef offering some of the best diving sites. If you want to dive in an exotic location with long stretches of white sand beaches, vast diversity of underwater wildlife and a lot of dive sites, then Aruba is the dive destination for you. Aruba offers one of the best dive sites in the world. With live corals teeming with underwater wildlife, you can never get enough dives in a day. NITROX mixes alters the air mixture by increasing the oxygen content and decreasing the nitrogen content. This is done by measuring the scuba tank content with NITROX analyzer. This is typically safer for most divers because this lessens the risk of nitrogen being trapped inside the body and cause bends. You need to have diving expertise if you wanted to dive in freezing cold water or diving deeper on a reef with lower visibility - Purchase a diving insurance or a travel insurance to ensure that you are protected if ever you encountered accidents during your scuba diving trips. - Learn airline restrictions regarding scuba diving equipment and weight limits. However, people prefer scuba diving as a recreational activity. The underwater world provides unique wild life that can really excite people. Scuba diving can provide you this kind of excitement by letting you breathe underwater and at the same time, explore the wonders of the underwater world. Scuba instruction is available in your local dive center that can certify you as a scuba diver. Diving becomes famous in the place not because of its being a favorite leisure activity for the divers but because people there want to take part in the preservation of aquatic resources. Hawaii is known for being one of the majestic focal points for scuba diving vacation. Majority of the vacationers prefer the scuba destinations in Hawaii because these are really well-preserved.