The Castle in the Ybor City area of Tampa is great if you like gothic music. Two floors, each with its own music.
Dress Code: Varieties of gothic wear, although you will see 'normal' people in polos and shorts. Just go with all black and you'll be fine.
This is a place where gothic people gather. It is a dark and dirty club on two floors with an awesome 1st floor bar. Despite the fact that some of the people who go there look weird [let's name a regular guest, a guy in a black thong and a women's black negligee], it is a safe place. People are friendly and you don't have to look gothic to go there. It is an 18 and up club.
Dress Code: People wear underwear, leather, silver dresses, evening robes, anything. Myself, I usually wear my wide blue pants and a tanktop and nobody cares. In general, wear anything you feel comfortable in, but nothing light colored, for you will get it dirty.