The dive sites are still being developed in the Quepos and Manuel Antonio area, and some of the diving outfits take customers as far as Isla del Caño. Sites are away from the contaminated beaches, so water pollution is not a problem when diving.
Sportfishing is big here, and offshore ventures are best from December to April, when sailfish are being hooked. By and large this is a high-dollar activity and you can expect to pay upwards of US$900 to hire a boat for the day. If you want to shop around a bit, visit the office of Marina Pez Vela, 500m south of the town center.