I go to bimini often in the summer. The fee to check in is 150 for boats under 35 ft, and 300 for boats over 35 ft. They allow a second visit for free if done within 90 days. The rules were relaxed a bit after the initial rules, I forgot all the specifics they are on the bahamas offical web site. If your going and dont look like a commercial guy, I wouldnt worry about the rules as bimini only gets a grey patrol boat from nassau once or twice a year usually on big weekends. By the way you are allowed a few lobster now, I think 6 per person or boat, and yes you must use a sling not speargun. Good luck! Also I have seen you mention on another thread that you want to trade corals. If your willing to drive to davie----we can do some trading, were you will win. Send me a pm if interested.
