One million gallons of water fun will thrill children, parents and grandparents alike at Collier County's premier water park, Sun-N-Fun Lagoon! Fun always starts at Sun-N-Fun Lagoon, a key destination by all. Sun-N-Fun Lagoon includes four pools, a long lazy river, a lit splash playground or interactive water feature, five exciting water slides, a concession stand other typical amenities such as restrooms and lockers.