Niall:
Nando's of course. You have never been there and so he wanted to take you to his favorite restaurant. Afterwards, you guys soon began going there everyday. ;)
Liam:
You guys go to Taco Bell. You both LOVE to eat tacos, so you guys head to Taco Bell.
Louis:
Louis loves to play on things, so he takes you to Chuck E' Cheese. You bring along your four little cousins so you didn't feel silly playing on things.
Harry:
You guys go to a Bakery owned by your favorite Baker, Buddy Valastro. You have always wanted to have Buddy design a cake for your guys anniversary, so Harry set it all up.