Thale Noi Nature and Wildlife Study Center, Phatthalung Province.
It's a very spacious tourist attraction. You should spend about 2 hours here to fully explore. There are boat tours available. If you have children, you can bring them along, but be a bit cautious.
The environment is great, with ample parking and clean, free restrooms. There are plenty of souvenir shops.
Due to limited time, I didn't get to go up the tower for the view, but I would definitely come back if I have the chance.