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AdventureSmith Explorations (adventuresmithexplorations.com) offers multi-day, all-inclusive river cruises aboard the 62-passenger "National Geographic Sea Lion Explorer." Accommodations are provided aboard the cruise boat, but passengers will depart the boat for land tours and some meals. This tour company visits locations such as Golfo Dulce, Monteverde, Sarapiqui, Arenal Volcano, the Osa Peninsula and Manuel Antonio National Park.