I guess I've not seen them in town, but on our property I have seen many, many iguanas and "Rich Willys". One crawled in my washing machine drain hose, and came out in a "whoosh" when it drained... then he ran off into the bamboo, standing up on his back legs. I died laughing. I wasn't laughing the next day when I went breezing into the laundry room (where I had left the door open) and there he was standing in the middle of the room, and I was blocking the door. I yelled for Raymond, and he "swept" him out with the broom.
I'm sorry you fearthem... Just keep a watch out for them, and avoid walking near foilage. <g> And have a good time!