Coronado's charm is largely due to it's location and all that it offers in a relatively small area of space. You can drive to it from the San Diego-Coronado Bridge, but if you have the time and want to take in the gorgeous scenery, take the ferry from Broadway Pier instead.
For an interesting look at some of San Diego's wildlife, make plans to get on board the city's only bus-boat amphibious tour known as the San Diego SEAL Tours.