You follow the map you were carrying and head south, where you feel the summer temperature getting hotter, and realize while keeping your eyes on the map, you were standing in sand. You hoped that you weren't headed to a desert, because judging by how the temperature at the park changes, it would be terrible.
Suddenly, as you look closer towards where you were going, you could see an ocean full of people, that didn't have any clothing on, and the water was covering them from the waist up. You looked even closer, and found that all of them were teenagers like you, and having fun in the water, and not the sand. You take a look at your map, due to how confused you are, and find the lower part of the map to where the beach was, and find that it was called "Merfolk Lagoon". Meaning those people at the beach were merfolk.