Hi there. I am planning to take a trip to San Diego County in late April to mid May. I would like to know what fun things there are to do, beautiful places to see, and such. I have been to San Diego County before for a shorter trip and have explored Balboa Park and the Gaslamp District. We'll likely be there for 4 days, so we'd like to explore SD County and see wonderful things the lovely county has to offer. Please help 