Celebrate Independence Day in San Diego with a boom. 70 miles of picturesque coastline invites visitors to view and participate in festive July 4th celebrations such as the epic 20-minute Big Bay Boom fireworks display over San Diego Bay. Like the holiday boat parade, this is the largest display in the region. fireworks are launched simultaneously from four barges placed around the bay and choreographed to music broadcast on 105.7 FM radio. Back for its 10th year, the Big Bay Boom fireworks display can be seen throughout downtown San Diego, neighboring Coronado, Point Loma and many communities throughout the city. Great viewing spots are all along the bay front and aboard popular harbor cruises. Fireworks begin at 9 p.m. on July 4.