Seasickness is a form of motion sickness. The best Great Barrier Reef tours for people who are prone to seasickness are tours to a pontoon (think of a pontoon being like a small man-made island) or to an island. The pontoons are activity platforms located in the middle of the Great Barrier Reef. There are popular tours from Cairns, Port Douglas and Airlie Beach that visit pontoons. The pontoons are at stunning reef locations with a large array of marine life. The boats that take passengers to the pontoons are typically large, fast, stable catamarans which minimise seasickness. Snorkeling, glass bottom boats (or semi submarines), underwater observatories are all included. Optional extra activities such as scuba diving and scenic helicopter flights are also available for an additional fee. The scenic helicopter flights from the pontoons are the best value helicopter flights around as your entire low-level scenic flight is spent over the Great Barrier Reef! Many reef boats have seasickness medication available on board, but most people benefit from taking seasickness medication before boarding the boat (even start taking medication the night before your reef trip) and taking more medication throughout the day. See a chemist or pharmacist for information on seasickness medications - there is a variety of medicines and remedies to help you. Boats and seasickness can be avoided altogether by taking a low-level scenic flight over the Great Barrier Reef from places such as Cairns and Airlie Beach.