Memory Beta, the wiki for licensed Star Trek content.

Tranquility Park was a public space in the municipality of Oceanview on Luna. It was built near the landing site of the Eagle at the Sea of Tranquility, and provided an observation area, separated from the site (and the vacuum) by a transparent aluminum wall. Leonard McCoy visited Tranquility Park not long after the Talin IV disaster, where he met a young girl named Glynis. (TOS novel: Prime Directive)