The exterior of Howlin Marlin is shown as a very small building with a wooden roof and metal walls. The sign that says "Howlin Marlin" is on an image of a marlin itself.
The interior of Howlin Marlin is shown to have wooden flooring. Other objects seen inside include tables, a dart board, and a picture frame with an image of a motorcycle on it.
Role in the episode
SpongeBob went to the Howlin Marlin with The Sharks and attempted to go inside. However, the bouncer there didn't allow them inside saying it's now a "Shark-free zone." Later, it was revealed that The Sharks indeed used to go to the Howlin Marlin many times, but they were kicked out due to one of the members, Jonnie, messing up during a dance move and ended up falling down and scratched the floor with his teeth.