Jason Bay has got it all figured out — sort of.

The underachieving left fielder arrived at Mets camp yesterday ready to forget about the last two seasons and give his team some bang for its $66 million.

"For everything I've done in my career, I haven't done any of it in New York," Bay said. "I completely understand that. I would like nothing more than to show everybody why I'm here, what I've done in the past and just kind of be me."

Bay is coming off a season in which he hit .245 with 12 homers and 57 RBIs. That gave him 18 homers combined in his first two seasons with the Mets, or exactly half his total from 2009, when he hit 36 bombs for the Red Sox and entered the MVP conversation.