Apologies for the confusion, but it seems there might be a misunderstanding in your request. Trim Square isn't a beach but rather a location that could be a public square or a similar urban area, and the details provided do not align with a typical beach setting, especially considering the activities and amenities often found at beaches. However, for the purpose of creating a vivid and engaging description based on the details you've provided and adjusting to a hypothetical beach-like setting for Trim Square in Nankoku, Japan, let's imagine a different scenario.