I know what you're thinking -- what the heck has gotten into Quiddler, swims is not a palindrome. Very observant of you and quite correct.
Swims is an ambigram, a word that looks the same upside down.
You're looking for a small, squat cylinder to which a magnet has been glued. There's a 50/50 chance you'll spot the hidding place from your vehicle.
You can pull off the west side of the busy road thirty or so yards to the north of the cache location.