Hoi An has options for snorkeling, scuba-diving, scuba-training and ocean floor walking, so there’s plenty to entertain underwater enthusiasts! Just off Hoi An lie the Cham Islands, which have their own coral reef, so many diving-related Hoi An tours are based there. Underwater tours often form part of a wider day tour, which might include a boat trip, beach time and food. Non-divers can take in the reef wonderland by dropping to the ocean floor with SeaTrek’s Underwater Walking Tour. You don’t even have to be able to swim!