Coconut Tree Hill is a classic Instagram worthy spot in Mirissa. Lots of tourist gather around this hill to watch the sunset and enjoy the calm ocean views. Its free to visit and only slightly hard to find (because its technically on private land but there is an uphill dirt path to follow once you walk in).

I recommend bringing something to sit on as its all dirt ground. Don't forget some snacks/drinks since there is nobody selling. Deff go for sunset the colors are unreal!