Seaside Beach is a sandy beach in Cardiff State Beach at the border between Solana Beach and the Cardiff-by-the-Sea area of Encinitas, CA. Cardiff State Beach is the long sandy strip along the west side of San Elijo Lagoon a large wetlands and ecological reserve. If you want to see the lagoon they have a visitor center on Manchester Avenue nearby. The parking lot at Seaside Beach is on Highway 101 just north of the city of Solana Beach. Highway 101 is between Cardiff State Beach and the lagoon for the entire length of the park. Surfers enjoy the waves that break over the reef known as Seaside Reef, Cardiff Reef, or Tabletops. Seaside Beach itself is narrow especially at high tide. When the tide allows you can walk south on the sand to the beach at Tide Beach Park below the high bluffs of Solana Beach. Rip currents exist so be careful where you swim while at Cardiff State Beach. There are many restaurant options just up the highway behind the North Beach of Cardiff State Beach.