San Diego Road Trip from Los Angeles?

I'll be driving my parents to Valley View Casino in San Diego later this week from Los Angeles. But I also want to visit some fun and interesting places in San Diego as well. So I'm wondering if there are any interesting attractions that are on the way or nearby the casino that we can stop by for a quick... show more I'll be driving my parents to Valley View Casino in San Diego later this week from Los Angeles. But I also want to visit some fun and interesting places in San Diego as well. So I'm wondering if there are any interesting attractions that are on the way or nearby the casino that we can stop by for a quick visit before we have to drive back on the same day??? Thanks in advance for your answers.
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