A less popular area of the water park for tourists but extremely popular among the locals was the Spa/bath house section of the park. This section of the park was actually open year long even as the more traditional part of the water park with the slides and wave pool shut down for winter.
There was a central area which branched out into two wings.
One wing was the traditional roman/Greek style bath house which had multiple mosaic and paintings of the Greek/roman gods as well as water based mythical creatures such as mermaids and merman. It had a large bath with smaller rooms for massages and smaller private baths.
The other wing broke from the Greek/roman style theming and was a Japanese style hot spring bath. The room was full of rocks and reeds. There were no private rooms here but instead the baths themselves were broken up into smaller more private sections. This was a favorite among couples and with the room darkened it looked great in the artificial candlelight.
Both of these were small and out of the way and a prefect place for portals to open. A portal would open this day, the question is who would stumble upon the portal and in which section the portal will appear.