This lake is very tranquil, it calms the mind.

This park is known for its tranquility.

We had a picnic in the park.

He didn't know that fact.

He found out the truth and was surprised.

He is really knowledgeable and always teaches us new information.

His voice had the power to calm the entire room.

He took a deep breath and calmed himself down.

We had a picnic in the forest park over the weekend.

We are planning to go to the national park this weekend.