If the two of you want to take a romantic trip but your busy schedules make it difficult to get away, you can still travel and maybe even learn something about San Diego in the process when you take an Old Town Trolley Tour.
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.