Tour agencies charge US$30 to US$40 for island tours, but most day trips are very rushed and give you little time to enjoy the Chams. Speedboats are often crowded, time for snorkelling limited, and the coral and marine life on display only average. Day trips by tourists staying in Danang are also becoming very popular. For the best one-day experience, book with one of the specialised dive operators in Hoi An. They can also arrange overnight camping stays.