River Ventures, located in Crystal River Florida conductes manatee swim tours daily, year round. Let our experienced captains and tour guides take you through the beautiful Crystal River National Wildlife Refuge for an up close and personal encounter with the most amazing animal of the sea. Allow us to share with you our love of these amazing creatures. Our tours are conducted under permit from the United States Fish & Wildlife Service allowing us to venture into the refuge to the home of the gentle giants. Our tours are conducted daily year round, including all holidays with reservation. Located in the hostoric district of downtown Crystal River, Fl.