The "dominant" male crocodile, which experts say was nearly 4m long, shut down Broome's Cable Beach on Saturday as it surfed and lurked in knee-deep water.
Onlookers gathered to catch a glimpse of the reptile that stayed in about the same location all day. By Sunday, it had moved on.
Broome woman Sharon Scoble said she was amazed by its size.
"He was a big boy - his head was huge," she said.
"It would be all over red rover if he got hold of you."