Plan to watch horse-racing San Diego

I love horse racing. I find it very thrilling to watch trained, well-bred horses racing for trophies and titles. As my friend and I are going to San Diego for a week off in the last week of April, we are thinking of dropping in at the Del Mar National Horse Show. I have heard it is a hugely popular equestrian competition in San Diego. Del Mar National Horse Show will be at the top of itinerary on San Diego vacation. Still I would like suggestions from people who have heard or attended this event?