The reason for this is because they need to be sure that you know all the things involved in scuba diving and that you are capable of handling problematic situation in case it arises underwater. Scuba diving may seem simple. However, it is far more complicated than just breathing underwater. You need to know everything involved in the underwater world and all about the scuba diving equipments to make your dive safe and more enjoyable. Scuba diving resorts will never allow you to go diving without certification from any of the agencies mentioned. This is because scuba diving can be dangerous if you don t know anything about it. For instance, you need to know about underwater pressure and how to cope with it. The pressure itself can be dangerous if you don t know how to equalize. If you are not able to choose the right one, you will never be at ease under the water. Thickness that ranges from 3 to 6 mm is the most ideal for an average diver. Type of wetsuit Your personal tolerance level will be an essential basis for this choice. This will also consider your diving location and the status of the water temperature in the place. Thailand is offering the best scuba diving resorts that have special instructors for people having great passion for scuba diving. The instructors are there to give guidance to the divers and enhance their skills more. Most of the good resorts found in Thailand are also rendering certification program upon completion of the training that are also given to vacationers who are interested to go for scuba diving classes. Costa Rica is an ideal diving destination because of its warm waters and also because of the diversity of marine life found in this country. Sharks are also abundant in Costa Rica. If you want to see sharks, Costa Rica is the place to go. Various species of sharks are seen in this area, including bull sharks. If deep waters really make you panic, then do not pursue scuba diving. Scuba diving is meant for deep waters and not for shallow waters. If you think you cannot swim swiftly, choose other hobby instead of scuba diving. With all these tips, you will know if you are capable to scuba dive or not. However, if your thoughts about the above tips are all positive then, there is no way stopping your self.