Arraial's iconic day trip is the boat excursion out to Ilha de Cabo Frio. Several agencies offer this service, stopping off at other beaches en route. The standard tour lasts about four hours, though some operators, like Embarcação Ericka Barreto, stay out longer.
Arraial is one of Brazil's top scuba diving spots. Tour operators who organize dives in these waters abound – the tourist office keeps a complete list.