Send my Fisherman in his cute fisherman gear fishing in the rain downtown behind the Old Salthouse going down a flight of stairs to the waterfront. There ar two fishinf spots with a view of the bridge...
I've seen them too. Just a little thing they put in at the wharfs to make it more realistic. There's always rats by fishermens wharfs in real life. You can't interact with them, they're just there.