Simon,
In April/May, my favorite fishing is for Tarpon right outside of Government Cut (Port of Miami) on a falling tide. Basically, you drift live shrimp or crabs and ……. WHAM
Reel squeeling and line flying off. 30 or 40 minutes later if your lucky you’ll get to meet a 100 to 125 Tarpon face to face.
All within about 200 yards offshore. Awesome!!!
Check this link for Guides:
http://www.charternet.com/fishers/florida-miami.html
Personally, I would recommend “Bouncer’s Dusky”. He has been at it a long time an is sort of a legend down here.