By far the most important tourism attraction in Cairns is its proximity to the Great Barrier Reef. It is at this point that the reef itself is closest to the mainland making access for charter boats easier. Cairns has a huge recreational scuba diving industry with several large diving schools and hundreds of charter boats. The industry caters for everyone. You may be a total novice or a highly trained professional, but you can be sure, you will find someone who runs a charter that caters to your requirements. Day trips on fast, ocean going catamarans are the most popular and these carry hundreds of tourists on each trip. This type of operation usually runs to a permanent pontoon anchored on the Great Barrier Reef, from which tourists can snorkel and dive with professional staff looking after the safety of their guests. Other services include day sailing trips to the reef and extended diving expeditions to remote reef to cater for the more adventurous certified divers.