The San Diego Padres @ Petco Park
This is the average amount of time after gates open that bobbleheads are still available
Mid-game (~3rd Inning)
This is the average percentage of game attendees that will receive a bobblehead
100% (All Fans*)
*For all the games I have attended, the Padres have done All Fan Giveaways!
Petco Park is an open roof stadium in southern California, therefore expect mild to even windy temperatures. It's not a bad idea to bring a light jacket to the park especially for night games. I would recommend you sit either behind home plate, or along the third base line to avoid getting tan.
This being San Diego, parking is going to be a little more pricey but downtown is quite walkable. Go with ParkWhiz. There are three locations which I recommend you park at which are just to the west of the stadium: The Omni San Diego Hotel, The Hard Rock Hotel and The Marriott Gaslamp Quarter Hotel. Luckily, for the three times I have parked in these locations the parking price was between $10-$15 but be prepared to pay about $25 minimum.
Assuming you used my advice and parked to the west of the stadium, you will enter through the Gaslamp Gate which is on 7th Ave next to the Omni Hotel. This gate has 8 security entrances all accepting bags, but the two on the far left are primarily for exit/re-entry. All regular gates open 90 minutes before game time.