So the bathing suit reminds him of the beach so he wants to go to the beach...
I know it is a made up book, but it was pretty silly. I guess it would be ok for little humans, but I didn't think much of it. Of course, I didn't read it under the best of circumstances. Maybe it's better than I give it credit for. You give it a read and judge for yourself.
Today's tip for Cat Children of Human People (CaCHuPs): This one is simple: if your human mentions the word "Veterinarian" run for your best hiding place and never come out...even for treats! {It's probably safe to come out after it gets dark...at least wait that long if you can}