I reserched about Coronado beach. San diego has Coronado island and take 15 minutes from downtown by car. Also you can go to this island by boat. If you want to feel ocean, I want to suggest to get by boat. There are many visitors in this beach. If you visit here, you can play marine activity like surfining. Also it is romantic to see sunset on the beach. The sun goes down into Coronado beach. It is so beautiful.