At the mouth of the San Luis Rey Valley, Oceanside's 3.5 miles of beaches offer things to do year-round. The harbor has facilities for boating and sport fishing; whale-watching takes place year round to see fin whales, humpback whales, minke whales and dolphins. Thursday through Sunday the Oceanside Museum of Art , 704 Pier View Way, rotating exhibits of works in traditional and innovative media each year; phone (760) 435-3720. Learn More...