The Hidden Beach is, as the name implies, a not very well known location in the Pocket Dimension. A beautiful beach with fine white sand and many palm trees, it provides a wondrous view over the large lake to the west of Magical Camp. The beach itself has no special relevance, but it does have a connection to the Mermaid Caves.
Eric(a) and team can access this location, and subsequently the Mermaid Caves, by talking to the Confused Magical Girl who spends her time at the lake. Eventually she will show up drenched and tell Eric(a) about the beach, and insist they visit it at some point. While this creeps Eric(a) out a little, the journey does provide a welcome change of scenery to the team members, only to have their impromptu vacation cut short as they are abducted by the Mermaid Princess.