One of my favouriate spot in Seoul is the floating Sevit island along HanGang. You can rent a small boat with your friends and hang out on the boat to enjoy the night breeze~
My friends and I celebrated birthday on the boat at HanGang, it was such a memorable experience, i will never be able to forget it. Hope i will go there soon again as weather becomes warmer.
Directions to get there :
You can take subway to Express Bus Terminal (고속버스터미널), from there, there is shuttle bus services that takes you to and fro from the Sevit Island.
So why not gather a group of close friends and spend some quality time on the boat at HanGang? Trust me, it will become one of the best memories in your life~ You can get some drinks and fingerfoods from convenience store there and bring it onto the boat, like what we did ~