Once Sebastian decided that his priority was to go round and scout the whole city, his first course of action was easily finalized in his head. Sebastian decided to get a map of the clown city first.
His priority was to know the city first before he could improvise on how to go forward with his other plans and to know the city, he needed a map.
As for how to get a map, all he needed to do was to ask around.
Though Sebastian didn't know the overall layout of this city yet, from how few clownfishes he saw here, he was able to easily guess that this part of the city was the outskirts that were reserved for visitors like himself.
Though this part of the city was probably reserved for visiting predators like himself, it still had the basic developments of a city, including what Sebastian could only describe as a monster bar.
