I then attach it to a baseball cap, and I keep adding pins to that cap until the end of the season. I always take pictures . . . When you arrive at a new ballpark for the first time, walk all the way around the outside before you go in to your seat.
Many people head into the first gate they see and never get the feel of the park.
If it is the only time you may be at that park, take a final mental picture before you leave. Otherwise I wouldn't be able to fit the pins. These are on display on my basement rafters. These are rotated weekly into a frame on the sideboard. Each park gets one page of the album.