Around Gongguan MRT (across from National Taiwan University) you'll find a warren of cheap eat streets rivalled only by Tonghua Night Market, which is great for fried and sweet treats.
Dongmen MRT station exit 5 places you at the top of Yongkang St, whose bustling side alleys practically define Taipei's food scene as the joyful and near superlative experience it is. Some of the best dumplings, beef noodles, Taiwanese and Japanese can be found here, plus shaved ice, Vietnamese and vegetarian dishes.
Shida is loaded with small eateries, funky cafes, fast-food outlets and a few excellent Western restaurants and, of course, the night market.
The side streets around Zhongxiao Dunhua MRT yield great Western eateries.
Potluck In Da'an Park
Since 2008 a merry mix of musicians and friends, both foreigners and Taiwanese, have gathered on the first Sunday of each month in Da'an Park to 'jam, drum, dance, juggle, play Frisbee, share food, make new friends and music, and share thoughts'. It is a community and environmentally conscious crowd aiming to create a fun haven for foreign–local interaction.
Anyone is welcome (including kids). Bring a friendly attitude, vegetarian-only food to share, your own bowl and utensils, and any musical instruments you have. The meeting time is between 3pm and 9pm at the second pavilion north of the Heping/Jianguo Rd intersection.
Check out the group's Facebook page (www.facebook.com/groups/taipeipotluck) for the next get together.