The Mets are extending the Fan Walk around Citi Field. If you missed out the first time, you can get another shot.
I've used up a fair amount of bandwidth highlighting the shortcomings of Citi Field. However, the Fan Walk is one of the best things about the new stadium. Fans authored some witty, poignant and just plain goofy notes on the bricks. My siblings and I chipped in for a brick for our parents and it was a big hit. If you want one in time for the holidays, place your order by 10/19/09 (Hanukkah) or 10/26/09 (Christmas).Here is the link for more info.