I have heard great things about the Fukuoka Yafuoku! Dome, home stadium of the Fukuoka SoftBank Hawks. It can accommodate close to 39,000 spectators, and it is Japan's first stadium with a retractable roof. Not a bad idea for games on days with bad weather.
I caught my first baseball game ever between the mighty Hawks and the Saitama Seibu Lions, and the experience was nothing short of amazing! The pictures will speak of the amazing experience I had, the upbeat atmosphere, and the fierce loyalty of the fans cheering forcefully at the top of their voices.