He/She would go to a pool to swim for a while and relax, like a normal person would do...
...until a group of weird-looking people (with a guy wearing a wizard hat among them) came and started doing crazy stuff at the place, like loudly cussing everyone and their mothers, throwing MechaTec employee badges at the water, eating the ornamental grass and trying to remove floor tiles looking for secrets... causing our newbie swimmer to flee in panic.
What would Sonic the Hedgehog do if he learned how to swim?