Coronado is an island so you have to cross the bridge to get there. There is a fare to cross the bridge.
When on the island you should park and walk around. You can also rent bikes and ride around the island. This is a great way to see the sights. May people rollerblade as well.
Coronado is connected to San Diego by the San Diego-Coronado Bay Bridge (FREE), with its distinctive curved span.
Doesn't it look impressive?