For someone who has never been to an opener, and I am not sure how the Angel's parking is set up, but in many places where you pay to park, expect the price to be WELL more than normal.
In St. Louis, normal 10 dollar lots were 60 - 80.
In Chicago, if you can find a side street, you pay nothing!
So, be prepared for that if you need to be. Anyone special throwing out the first pitch? Plan on higher security and longer turnstyle line waits.
If you are 21, and have the time, go early and hang out at a nearby bar? Helps traffic, which I absolutely hate.
I like to watch BP tho, so I am always earlier than the rush.