If you need a change from Lym's, Pangea, Funky Fish, and Fat Turtle for sunset this is an excellent option. It's a little bit further away, on a cape to Saladan, but it's a beautiful drive and well worth it.
The bar is an extensive cozy bamboo construction with plenty of seating and excellent sunset views. They also have a small infinity pool you can use for free. The only downside is that food and cocktails aren't that special (but by no means bad) and pricy outside of happy hour (ends at six).
But move on to any of the excellent restaurants in Saladan or Klong Dao afterward and you're set.