Harry-he keeps it romantic (like a meal at home or a quite date) and he doesn't want it to be overpowering.
Niall-I'm sure he would take you to a restaurant :P and out for a nice meal but then walk/drive you home to make sure your safe.
Louis-he would take you to a carnival or somewhere fun and energetic.
Liam- he would take you ice skating, hopefully you would fall into his arms ;)
Zayn- he would take you to the movies and watch a horror film so you can cuddle up to him
