Sukhirin District, Narathiwat Province

Sukhirin District is very natural. Nearby tourist spots include the southernmost point of Thailand, which is easily accessible by car on a paved road. You'll pass a Thai military base before reaching the marker. Once there, you can see the tower on the Malaysian side with stationed soldiers, and taking photos is allowed. After that, head to the Mysterious Hill where cars roll uphill on their own. Narathiwat has one too! Nearby, you can also visit the giant Kapong tree, which is truly massive. It's the largest tree I've ever seen. However, the entrance is quite secluded and walking alone can be scary. On the way back, I ran out quickly.