Agios Nikolaos (Ag Nik for short) is a coastal town on the island of Crete, full of beautiful beaches, lovely weather and wonderful cocktails!
I would recommend spending the day relaxing on the beaches or by the public swimming pool (great views from here and you can also access the beach if you want) or taking a drive/walk around the scenic countryside. Something relaxing so that you are ready to try out some of the great restaurants and bars in the evening. Amazing Greek food and amazing cocktails make for a perfect combination! A good place to visit after dinner is Puerto Bar or Aquarius, which are both a lot of fun!