I found exactly three things of interest in San Diego when I spent time there a fw decades ago.
1. The HArbor and moreso, the US NAvy there.
2. The ZOO. Definitely worth seeing.
3. The Carmel Ranch Country Club.
From what I understand the golf club is either now a thing of the past or just unkept.. It was beautiful when I spent some time there.
The Zoo is a must see attraction. Take a HArbor cruise in the evening with mrs. De. Put a jacket on as the water is chilly at night.