Coronado Island is connected to the City of San Diego by the San Diego-Coronado Bay Bridge. It’s also accessible by ferry. The area includes some nice beaches, shopping and dining. There are bike paths along the tidal pools and beaches. Silver Strand State Beach seems to be especially popular with kite-surfers and campers.
Further along, just a few miles from the Mexican border, Imperial Beach is the most southwesterly community in the U.S.
The atmosphere there is more laid back, with a fishing pier, lots of rental beach houses and a few restaurants. Tijuana Slough National Wildlife Refuge and Border Field State Park are nearby for walking and wildlife viewing.